NVIDIA Coin Mining Performance Increases with Maxwell and GTX 750 Ti

Subject: General Tech, Graphics Cards | February 20, 2014 - 05:45 PM |
Tagged: nvidia, mining, maxwell, litecoin, gtx 750 ti, geforce, dogecoin, coin, bitcoin, altcoin

As we have talked about on several different occasions, Altcoin mining (anything that is NOT Bitcoin specifically) is a force on the current GPU market whether we like it or not. Traditionally, Miners have only bought AMD-based GPUs, due to the performance advantage when compared to their NVIDIA competition. However, with continued development of the cudaMiner application over the past few months, NVIDIA cards have been gaining performance in Scrypt mining.

The biggest performance change we've seen yet has come with a new version of cudaMiner released yesterday. This new version (2014-02-18) brings initial support for the Maxwell architecture, which was just released yesterday in the GTX 750 and 750 Ti. With support for Maxwell, mining starts to become a more compelling option with this new NVIDIA GPU.

With the new version of cudaMiner on the reference version of the GTX 750 Ti, we were able to achieve a hashrate of 263 KH/s, impressive when you compare it to the performance of the previous generation, Kepler-based GTX 650 Ti, which tops out at about 150KH/s or so.

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As you may know from our full GTX 750 Ti Review,  the GM107 overclocks very well. We were able to push our sample to the highest offset configurable of +135 MHz, with an additional 500 MHz added to the memory frequency, and 31 mV bump to the voltage offset. All of this combined to a ~1200 MHz clockspeed while mining, and an additional 40 KH/s or so of performance, bringing us to just under 300KH/s with the 750 Ti.

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As we compare the performance of the 750 Ti to AMD GPUs and previous generation NVIDIA GPUs, we start to see how impressive the performance of this card stacks up considering the $150 MSRP. For less than half the price of the GTX 770, and roughly the same price as a R7 260X, you can achieve the same performance.

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When we look at power consumption based on the TDP of each card, this comparison only becomes more impressive. At 60W, there is no card that comes close to the performance of the 750 Ti when mining. This means you will spend less to run a 750 Ti than a R7 260X or GTX 770 for roughly the same hash rate.

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Taking a look at the performance per dollar ratings of these graphics cards, we see the two top performers are the AMD R7 260X and our overclocked GTX 750 Ti.

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However, when looking at the performance per watt differences of the field, the GTX 750 Ti looks more impressive. While most miners may think they don't care about power draw, it can help your bottom line. By being able to buy a smaller, less efficient power supply the payoff date for the hardware is moved up.  This also bodes well for future Maxwell based graphics cards that we will likely see released later in 2014.  

Continue reading our look at Coin Mining performance with the GTX 750 Ti and Maxwell!!

To illustrate this example, we put together two builds of mining computers that should be capable of similar hashrates:

  R9 270X Mining Rig GTX 750 Ti Mining Rig
Processor AMD Sempron 145 - $55 AMD Sempron 145 - $55
Motherboard GIGABYTE GA-990FXA-UD3 - $135 GIGABYTE GA-990FXA-UD3 - $135
System Memory Kingston Value RAM 4GB 1333MHz - $40 Kingston Value RAM 4GB 1333MHz - $40
PCIE Riser Cards 1 x 16X to 1X Converter - $10 3 x 16X to 1X Converter - $30
Power Supply  Corsair CX750 Builder Series - $80 Corsair CX500 Builder Series - $50
Graphics Cards 4 x Radeon R9 270X - $1200 6 x MSI Graphics Cards N750Ti  - $990
Price $1520 - Full Cart on Amazon.com $1300 - Full Cart on Amazon.com

In these two builds, the core platform stays the same, with the AMD Sempron 145 Single Core processor. While this processor would be essentially useless for a lot of other tasks, Coin mining on a GPU is not a CPU intensive task, so we can get away with one of  the cheapest CPUs on the market.

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We chose the Gigabyte 990FXA-UD3, as it was the cheapest motherboard we could find for this platform with 6 PCI-Express ports.

As you have probably noticed not all of the PCI-E ports on this motherboard allow for a x16 card to be plugged in, and even the ones that are capable don't have proper spacing for 2 slot cards. To remedy this we have included the appropriate adapters.

Due to the fact that we are using PCIE risers, there is no case included. You would most likely be best served by building an open-air test bed for the system out of milk crates, shelving systems, wood, or some other building material. Just remember, it doesn't have to look pretty to be effective!

There is also no storage option included. For something like this you could either use any spare hard drive you have laying around, or even install a Linux distribution to a thumb drive. Due to this, we found storage to be a negligible option.

First, we have a more traditional build, using 4 x R9 270Xs, which we found available on Amazon right now for just above $300 each. With 4 of these cards running at about 450KH/s each, we should have a 1.8MH/s machine. With a power draw of 150W from each card, we get a total of 600W just for the GPUs alone. Throwing in another 75W for the 45W TDP processor and any additional overhead, we come to approximately 675W power draw for our entire mining rig.

At a total cost of around $1520, this machine would have a payoff period of about 113 days at the current Dogecoin rates, at 1.8MH/s

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Our second build is based on the GTX 750 Ti. This time we instead opted for 6 x 750 Ti cards for a total of $900, which is still significantly lower than the $1200 for 4 270Xs. With 6 x 750 Ti cards, the estimated GPU power draw would only be 360W, just above half of the power draw of the 270X machine. Adding in the same 75W for additional system components the total estimated power draw works out to 435W, which allows us to purchase a cheaper power supply.

At a total cost of around $1300, this machine would have a payoff period of about 97 days at the current Dogecoin rates, at 1.8MH/s

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As you can see, by cramming more of the lower end but impressive GTX 750 Ti's into a single machine you can create a similar performing machine for less money than the AMD alternative, which is contrary to all the advice given about coin mining up to this initial release of Maxwell. In addition, performance of the Maxwell-based machine should only improve as the Maxwell kernel for cudaMiner is developed further, whereas OpenCL performance for AMD mining has likely been as optimized as we will ever see it.

An additional factor you have to keep in mind is the fluctuating cryptocurrency market. Just because the payoff estimates today say you could be making a profit in 80 days, doesn't mean that will remain the same in the future. While the estimate could get better, it also could get a lot worse, leaving you with a lot of hardware to sell off in the future.

While no one is sure where the mining market will be as far as profitability is concerned when the high end Maxwell GPUs hit the market, NVIDIA could have a similar stock issues and an inability to deliver GPUs to gamers as we see AMD having today.

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February 20, 2014 | 06:10 PM - Posted by Angry

Oh yeah sure make all the GPU prices go up!!!

While I'm impressed, I don't like it. I'd like to upgrade my GtX 670 when the higher end maxwell chips hit, but the way things could and probably go....I won't be able to unless I plan on spending more than the MSRP....just like anyone who wants an AMD card at the moment. Its gonna be really bad if both nvidia and AMDs cards are way above MSRP.

Great review and I recommend the card to a friend instead of a 7790 (he's has an OEM system like the ones you tested with the 750 earlier).

February 20, 2014 | 06:38 PM - Posted by Anonymous (not verified)

Better start reserving your 800 Series cards early. I'm talking pre-order and pad the delivery mans wallet early.

February 20, 2014 | 07:26 PM - Posted by pt3322

I'm obviously glad that Nvidia finally offers good mining cards.

But if I were you, I'd look how much power those rigs pull from the wall with a Kill-A-Watt or similar, before I present a bogus graphic with "Mining performance per Watt" based on TDP.

It's obviously nonsense to claim that stock or OC'ed 750Ti use the same power and give more Kh / W. But somehow you missed that.

Miners also tend to undervolt their cards to reduce noise, heat and power cost.

Edit: you are suggesting that the current prices are $150 for a 750Ti and $300 for a R9-270x? In Europe, a 750Ti and a Gigabyte or Sapphire R9-270 cost the same.

Edit2: Oh, I guess you picked the cheapest 750Ti and the most expensive, worst-rated R9-270x at Amazon by accident too.

February 20, 2014 | 07:37 PM - Posted by Ryan Shrout

We aren't using European prices here.  And in reality, the focus of the story is much more on the power efficiency side of things than actual cost.  As we have seen in recent months with GPU prices they will scale WILDLY from day to day.

February 20, 2014 | 07:48 PM - Posted by Ryan Shrout

Also just to point it out, our Performacne per Dollar graph is using a base price of $280 for hte R9 270X.  Only the link to Amazon uses a higher priced unit.

February 22, 2014 | 08:31 AM - Posted by Anonymous (not verified)

And to be honest, you failed miserably on that. TDP is not real power consumption. AMD and Nvidia use TDP in a different way. AMD TDP is more like a theoretical maximum value you can almost never measure in real applications. Nvidia TDP is more like a typical value you actually can measure in real applications. Sorry to say that but your charts are quite worthless.

February 20, 2014 | 07:39 PM - Posted by Ryan Shrout

Your concern about power measurement versus power rating is valid, but our power testing gear is only to work "at the wall" and as such takes the entire system into account.  That can be interesting for some testing and some analysis, but for this story we decided to use TDP.  

Mining is among the GPU intense workloads for a GPU and in my experience the TDP if a very close level of expected power draw for ecah card.

February 22, 2014 | 04:29 AM - Posted by Martin Trautvetter

I have to agree you should have tested the power draw yourself, who knows what Nvidia and AMD classify their TDP as, and if scrypt mining is considered part of that evaluation.

I certainly don't mind the at the wall readings, as long as the PSU stays the same over the whole test, idle vs. load will still tell a close enough story about the real life power usage. I hope you'll add it for the next overview!

February 23, 2014 | 12:30 PM - Posted by arbiter

AMD has been known to under rate their draw, least on cpu side where their cpu with claimed 125watt TDP ends up being more like 150.

February 20, 2014 | 07:21 PM - Posted by Trevor McCourt (not verified)

Now coin mining can ruin the price of all brands of graphic cards. Lol

February 22, 2014 | 08:26 AM - Posted by ZoranICS

It's the greedy resellers and dumbasses that are willing to pay the extra that raise prices. not minig ;) If noone bought for a higher price, noone would sell at a higher price.

February 26, 2014 | 01:09 AM - Posted by Anonymous (not verified)

Then nobody would get a mid range graphics card.

February 20, 2014 | 07:26 PM - Posted by Christian Buchner (not verified)


Overclocking the 750Ti is handled via the GPU Boost 2.0 feature:

- nVidia GPU Boost 2.0 only overclocks within the limits of the TDP design of the card.

- most 750 Ti card designs draw their power exclusively from the PCI express bus (no 6 pin power connector provided), so this overclocking limit cannot currently be raised above 100% TDP (maybe possible later with a modded VBIOS).

Other nVidia GPU models will allow you to raise the TDP limit for overclocking significantly above 100%, but this one refuses to do so.

February 20, 2014 | 07:42 PM - Posted by Anonymous (not verified)

Good article, only gripe is the comparison rigs. Should have used regular 270's for ~250 each and rated at 470+ kh/s since that's the standard most miners are building around. The x versions aren't any faster when overclocked.

Very happy to see more competition in this space. The 750 ti and r7 265 should help reduce the premiums on all the other r9 cards (I hope)

February 20, 2014 | 09:00 PM - Posted by muchhash (not verified)

I think your hashrates for the older Nvidia cards are off. They seem to be pulled from the litecoin wiki, which doesn't represent the newest version of cudaminer from 12/19 onward.

Here are some better numbers:

February 20, 2014 | 09:09 PM - Posted by Ryan Shrout

We actually re-ran all the GeForce results just yesterday to make sure they were accurate with the same version of the CUDA miner.

February 21, 2014 | 01:56 PM - Posted by muchhash (not verified)

You are still quite off from what others are reporting. I am getting around 350kh/s stock with a 770 and over 390kh/s overclocked. You can't leave cudaminer settings on auto as it rarely finds the correct setting.

February 23, 2014 | 12:32 PM - Posted by arbiter

Could been the number at the time test's were done, like that cuda miner has been more optimized to get better numbers outta it since 770 was tested.

February 20, 2014 | 09:36 PM - Posted by Anonymous (not verified)

For you to achieve the same desired hashing rate, it will cost more to build with GTX 750 TI OC; while consuming the same amount of electricity. (Comparing to undervolt r9 280x @750Kh/s @ 420 before tax and 475 after tax @ 13%)

February 20, 2014 | 09:43 PM - Posted by Anonymous (not verified)

I like the fact that nvidia has made some effort to make their cards mine better. This new release looks good in a sense that it doesn't require big power supply cos' it uses less power. 6x 750 ti seems solid option now, I guess they are pretty quiet too, only problem is the room.

If you can achieve 294 mH/s with 640 cuda cores, we will probably way over 1000 mH/s with high end cards when they arrive. That is if hashrate scales well.

I have to point out that in this article you have unoptimized settings at least for 290/290x. My 290s(non-x) do 830(elpida) and 841(hynix) @ stock (using W7). I use settings from here http://tinyurl.com/pyu7elz except overclocks, these things squeal enough @ stock.

February 20, 2014 | 09:54 PM - Posted by Anonymous (not verified)

Great write up!

February 20, 2014 | 09:58 PM - Posted by Anonymous (not verified)

That you would even validate that this is an issue by basing your article on the *coin world is ridiculous and destroys any respectability you might have had. Get back to real articles and leaves theses scams to others.

February 21, 2014 | 12:24 PM - Posted by El_Phantasmo (not verified)


How could one writing about GPU hardware not acknowledge the influence of cryptocoin mining? Putting blinders on doesn't help you and it definitely wouldn't help PCPER. They're articles about mining performance just shows how progressive and open PCPER writers are about what's happening in computer hardware. Would you really want PCPER to suffer the consequences of not keeping up with changes in the market?

PCPER, do you think prices of AMD cards will drop now that nVidia offers something competitive for mining? Or will it really be inflated cards across all GPU hardware as people are predicting and commenting on here?

February 20, 2014 | 10:20 PM - Posted by Anonymous (not verified)

Yaaay! Now No one will offer good cards at a good price!
Fuck you all

February 20, 2014 | 10:33 PM - Posted by Anonymous (not verified)

lol Nvidia's already been milking the market since the day the 600 Series dropped. Only cards that were somewhat decent were the 660 and 680. Everything else got milked and has continued ever since.

I have that feeling we are in for some more rude pricing schemes with R-300 and 800 Series cards to follow.

March 5, 2014 | 06:24 PM - Posted by Anonymous (not verified)

YAY I don't need a new top of the line gaming gpu every 3 months fucktard!

February 21, 2014 | 02:29 AM - Posted by JohnGR (not verified)

I am waiting for your article about

"How selling more cards to miners it is bad for Nvidia".

February 21, 2014 | 01:22 PM - Posted by Anonymous (not verified)

It made Ryan curse on the last podcast. It was a pleasant surprise to see the anger and frustration finally boil over. :D

February 21, 2014 | 04:43 AM - Posted by Mac (not verified)

So an OC'ed 750Ti has the same rated TDP as a stock one?
You might want to revisit those hash/watt numbers and maybe use actual values instead of stated ones

February 23, 2014 | 03:25 PM - Posted by arbiter

The value used was based on wall watts and if they say it was same tdp probably assumes that wall draw was same.

February 23, 2014 | 03:25 PM - Posted by arbiter


February 21, 2014 | 06:10 AM - Posted by Cosmin (not verified)

I really enjoy having a mining option from Nvidia.
But for this article, did you built the 2 rigs (like really built them in reality) or you just made them up on paper?
You got a screenshot with 750TI hashing away but it is only one card.
Would have been a nice article if it was based on 2 real rigs with power consumption measured with a kill-a-watt.

February 21, 2014 | 08:17 AM - Posted by MarkT (not verified)

Cold? turn yer machine into a mining rig, problem solved.

February 21, 2014 | 10:39 AM - Posted by dingo (not verified)

die crypto coin just die

February 21, 2014 | 11:31 AM - Posted by Anonymous (not verified)

"By being able to buy a smaller, less efficient power supply the payoff date for the hardware is moved up."

Are you insane? If you are any type of miner, you know that you will be using multiple cards, multiple rigs. In this case you will have to build even MORE rigs because you are running such a gimped card, so that multiples your costs of motherboard, PSU, RAM. That moves your payoff date even FURTHER back.

It's hilarious seeing all these articles pop up about this crap card and the writers clearly don't have a clue what they are talking about.

February 21, 2014 | 01:29 PM - Posted by Pete (not verified)

There is one obvious flaw with your evaluation. The board you are using in both rigs can not run 6 Nvidia 750ti cards, but only 3. The power for the card (60w) has to be provided through the pcie slots and you can only physically fit 3 cards in there because of double slot cooler.

Most of these cards do not have external 6 pin power connector, so powered PCIe risers are out of question too as they can't provide enough power (unlike 270 or 270x cards which can be used with risers just fine).

Casual users that want to run one, maybe two cards would be better off with 750ti indeed, as the price/performance/power ratio is great.

February 21, 2014 | 05:08 PM - Posted by Anonymous (not verified)

You're not reading article closely enough. Look at list of parts, see risers:

Lets you use all 6 slots, and the molex connectors on the risers power the cards no need for 6pin.

February 21, 2014 | 07:12 PM - Posted by Anonymous (not verified)

they include risers, but since the cards do not have PCI-E power recepticles, they have to draw power from the motherboard. please someone correct me if i am wrong, but 6 cards pulling 60 watts seems way out of spec from PCI-E motherboard power supply which is 75 watts.

February 21, 2014 | 07:14 PM - Posted by Anonymous (not verified)

replying to self. i see now they are powered risers. but that still sounds dangerous...i have read reports of powered risers feeding power back into the pci-e power from atx and causing all sorts of issues. again please correct me if i'm wrong!

February 23, 2014 | 12:36 PM - Posted by arbiter

Its not 75 watts for ALL the slots, its each slot can provide 75 watts. If it was 75 watts over all slots you would seen a problem with SLI/CF rigs.

February 21, 2014 | 08:42 PM - Posted by Anonymous (not verified)

How would the other 3 cards hold in place? What kind of computer case would you need to house all 6 cards? I have a problem seeing how this is even possible.

February 22, 2014 | 01:41 AM - Posted by Anonymous (not verified)

Just saw this. Here's one possible solution:
Riggit Revision 9 Custom Mining Frame & Testbench 6 Triple Slot Cards XL-ATX E-ATX Dual PSU Mount


February 21, 2014 | 02:28 PM - Posted by Prodeous

Its facinating to see this 750TI perform at same level as my 680.

Wonder how it would perform with Blender or other Cuda compute benchmarks

February 21, 2014 | 05:22 PM - Posted by Anonymous (not verified)

What part of Blender is using Cuda, Blender is using mostly OpenGL(in the 3d editor), and the CPU for CPU rendering, but it does have cycles render which uses CUDA for some builds AFAK. I would love it if Blender would use OpenCL, and try to get more 3D editing functions using more CPU cores, and OpenCL acceleration of Mesh editing! Rendering is not so bad, as far as work flow is concerned in Blender, just start the render and come back when it's done, but editing high-poly count meshes, man waiting for a simple mesh relax, and other mesh operations can really slow down the creation process. I can not wait for Blender to start taking advantage of more HSA type systems/drivers, and to utilize OpenCL, etc. drivers to speed up the mesh editing process. Photoshop gets more benchmarking than any of the open source alternatives, and I wish that Blender benchmarking would become standard for any new graphics cards reviews, including the OpenCL, openGL, and other benchmarks, even something as simple as loading a system with a high a resolution mesh/scene with lots of meshes, in the editor to see the maxium mesh polygon count that a graphics card can comfortably handle in Blender's 3d editor(openGL). Graphics wise, as a whole, most of the benchmarks are about rendering, but few if any at all, cover complex high-poly mesh editing performence, and its complete times. Image filtering get its share of benchmarking also, but mesh editing tasks can be just as processor intensive.

February 21, 2014 | 06:23 PM - Posted by Anonymous (not verified)

Did Nvidia move this Maxwell into play quickly to get in on some of this “crypto-craze”? You almost have to think they did, they just wouldn’t sit sidelined knowing they had this capability. It will be great to get some parity back in the market. Nvidia surely knowing this has moved all there wafer starts for GK106 and probably other like GK107 month ago to started a stockpile of these GM107 28Nm and geared up to meet the demand. So perhaps with each machine running 6 cards that provide total hash, while still super low power, for those who are working legit and not stealing the power this has a place.

February 21, 2014 | 10:33 PM - Posted by Kaotik (not verified)

You really can't be serious with the "Mining performance per watt"-graph, it has absolutely no relations to any sort of reality out there.

No, the cards do NOT draw exactly their TDP when mining, you should know that and if you don't believe me, test yourself.

ExtremeTech actually took the time to test cards mining performance and compare it to the actual power draw, not just a number the IHV decided to put as the official TDP, which aren't comparable between different cards anyway (meaning that card x is closer to it's TDP in real life workloads than card y)

February 22, 2014 | 12:20 AM - Posted by SwissBeatz (not verified)

263Kh/s???.. WTF?.. Even if you buy 6 of that and shove it on an ASROCK
mining Mobo, that wouldn't do you much benefit. YES, the price is low BUT
the PERFORMANCE too! :-(

AT $150, you are WAY-WAY BETTER of with a Radeon HD6950 2G
@ stock performance you can EASILY reach 390-415 Kh/s with it
PLUS you get to MOD it depending on the brand and when MODDED it will
crank around 440-460 Kh/s if you got the MOD right :-) Regardless if you
run it on stock STILL, its a much much better option :-)

No offense to nVidia tho who knows they might come up with
a much better alternative when their 800 series comes out. :-)

February 23, 2014 | 04:10 PM - Posted by arbiter

Radeon HD6950 === 200watt TDP card. 750ti is 60 watt card. And as said in story speed of cuda miner is likely to improve as the hash miner is optmized where as opencl one amd cards uses is pretty much as good as it will get. This story is about best bang for $ in terms of buying the hardware and time it takes to mine enough to pay it off. AMD cards fasters yes but power usage makes them cost more to run hence longer to pay off.

Should read the story and understand what its point is before start spouting out stupidity.

February 22, 2014 | 01:00 AM - Posted by SwissBeatz (not verified)

Oh by the way, LIECOIN and some other Popular Scrypt
based Digital currency are BASED on OPENCL and when it's
based on OPENCL rest assured, it will RUN EFFICIENTLY on the
Majority of RADEON VIDEO CARDS SPECIALLY the 6000,7000 and R8-R9
models tho as of now, CUDA based MINING while utilizing the
features of OPENCL to speedup calculations and data crunching
STILL, its has a VERY long way to go UNLESS the Developers of the
Scrypt mining applications LITECOIN(specially) and the
others would release a version of their digital currency
that would run as fast as the Radeons while using CUDA cores
But too late for that since CUDA is proprietary based model
and OpenCL is a much better option, CUDA doesn't stand a chance
as of now in the Near futre maybe, but for today if you're
thinking about investing 13-15 grand of your hard earned money
and want to mine Sctypt based digital currency and crank
somewhere in the 10,000-11,000 Kh/s GO FOR R9 290X video
cards installed on a 3 Gigabyte hi end gaming mobos (4 video
cards per mobo) like those PROs do and depending on the
mining site you're signed with, Soon you'll be on the top
miners ranking earning a lot of Digicoins... :-) LOL!

March 6, 2014 | 10:46 AM - Posted by Anonymous (not verified)

while reading this inane post i thought to myself "look at this idiot! Anybet he'll end this post with a LOL"

You didnt dissapoint

February 22, 2014 | 03:31 AM - Posted by Martin Trautvetter

Thanks for the test, looks like Nvidia is (once again) more expensive to buy, but cheaper to run in the long term. (local prices over here, NA seems completely out of whack)

Can't wait for something more beefy based on Maxwell!

February 22, 2014 | 04:29 AM - Posted by Anonymous (not verified)

My ELSA GTX760 hits 300k/hash overclocked to 1150MHz

February 22, 2014 | 07:26 AM - Posted by Kieran (not verified)

Can you guys please confirm that this machine (the 750ti's) will definitely work? There are no areas you may have overlooked??? Thanks!

February 22, 2014 | 07:52 AM - Posted by Mac (not verified)

Well they are showing hash/rated TDP as hash/watt for one, which is just wrong

February 22, 2014 | 08:34 AM - Posted by Kieran (not verified)

That is true. However, sadly, that doesn't really answer whether or not the build would function properly as described.

February 22, 2014 | 08:35 AM - Posted by Kieran (not verified)

True. Sadly that doesn't answer my question though :(

February 22, 2014 | 08:37 AM - Posted by Kieran (not verified)

True. Sadly that doesn't answer my question though :(

February 22, 2014 | 08:51 AM - Posted by Kieran (not verified)

Wow glitch... Sorry about that

February 22, 2014 | 08:28 AM - Posted by Kieran (not verified)

If you were to plug one of these (see link at below) into each of your cpie slots (using the suggested mobo that's 2 x PCIe1x, 1 x PCIe4x and 2 x PCIe16x) could you end up have five of the splitters, meaning you'd have 15 cards from the one mobo. Is that easy enough to do? Obviously you'd need multiple PSUs.


If not could you do the same thing with these (see link below) and at the end of each splitter use a PCIe1x to PCIe16x adapter)



February 22, 2014 | 05:17 PM - Posted by PapaDragon

Great article Ken!

February 23, 2014 | 01:19 AM - Posted by Anonymous (not verified)

LOL, what BS! Terrible, clueless article.

February 24, 2014 | 01:56 PM - Posted by madhatter256 (not verified)

Nice write up.

That hashrate is about the same rate the AMD 7870HD card gets, but without the power requirement!

February 24, 2014 | 04:04 PM - Posted by Mac (not verified)

No, the 270X is essentially a 7870 and it gets ~450khash

February 24, 2014 | 10:33 PM - Posted by Shaun (not verified)

I just want to chime in and say I can pull 540 Khash on my Reference EVGA 780 with a prolimatech mk 26 not going over 46C.

Setting power target to 75%, the voltage is at 1.00 and running at 1019mhz core (+144 core from stock).

The best part, it's only pulling 170 watts from the wall. If I do the khash/watt, that's 3.17 khash/watt.

February 25, 2014 | 09:35 AM - Posted by Grosminer (not verified)

I don't understand why you say it need only 60w of power ..
Gigabyte and EVGA card description says it need 400w or greater psu..! (EVGA says minimum 20 amps in the +12v rail)

February 25, 2014 | 04:00 PM - Posted by Shaun (not verified)

"I don't understand why you say it need only 60w of power ..
Gigabyte and EVGA card description says it need 400w or greater psu..! (EVGA says minimum 20 amps in the +12v rail)"

Well 20A on a 12V rail is minimum of 360 watts. The card itself will only draw 60 watts (TDP) at most.

February 25, 2014 | 01:04 PM - Posted by Anonymous (not verified)

If this is really the case then Nvidia would be stupid not to come with a Maxwell on say 240mm2 Dia; provides something between the GTX760-770 with the low power and “hashing” that’s more like a R9 280X all for $300.

Competing with a 50% smaller chip and say 140W TDP would be a big boon. Waiting almost all of 2014 for 20Nm is nut’s, as a marketing guy I’d be beating down every door to get that product now!

February 25, 2014 | 04:00 PM - Posted by Shaun (not verified)

I don't understand why you say it need only 60w of power ..
Gigabyte and EVGA card description says it need 400w or greater psu..! (EVGA says minimum 20 amps in the +12v rail)

Well 20A on a 12V rail is minimum of 360 watts. The card itself will only draw 60 watts (TDP) at most.

February 26, 2014 | 04:17 AM - Posted by Anonymous (not verified)

Is there a spe3cial reason not to use the R9 280x in the comparison table as well?


February 26, 2014 | 04:06 PM - Posted by Anonymous (not verified)

how did you guys run the 4 video cards, that require 2 PCIe connectors (each), with a power supply that only has 4 PCIe connectors included? :s

March 4, 2014 | 01:39 AM - Posted by Anonymous (not verified)

I'm new to this, so be kind, but what kind of power supply are you running?

March 4, 2014 | 03:12 AM - Posted by UncleRuckus579

Could I get the full specs on those machines? I started Dogecoin mining, got drunk, and essentially ordered all those parts off of Amazon except I went w 4 x GPU, will be running a milk crate for a case, and Windows for the OS. I'm also wondering, what was the power supply for the system? I would greatly appreciate more info as to put this system together, as I have only assembled gaming computers in the past with GPU's in slots, not with jumper/extensions.

March 6, 2014 | 03:09 PM - Posted by Anonymous (not verified)

I have two GTX 750 ti cards mining on the 2014-0228 version of cudaminer. With Afterburner OC'ing the video cards at +75MHz for the Core, and +500MHz for the Memory (most stable for my setup), I'm getting about ~292KH/s on each card with temps of 65-70C, while only consuming 188W total at load (system idles at 48.5W). This is running on a rig with an Intel i3 4330 CPU, 4GB of RAM, 128GB SSD, ASRock MB, and SeaSonic 550W Gold PSU in an ATX case.

My next build will be 6 x GTX 750 TI cards on powered risers, ASRock BTC MB with 6 PCIe slots (MB has auxiliary power for GPU mining), Intel G3220 CPU, 4 GB of RAM, 64GB SSD, with a 550W Platinum PSU. I expect a hashrate of ~1.7MH/s while only consuming less than 500W for a build cost of less than $1300.

March 17, 2014 | 03:57 PM - Posted by Anonymous (not verified)

My GTX 780 lightning does 700kh/s on 1306Mhz @ 70 celcius
undervolted ,( 1.145v it will crash if i game like this).

but 97.1 % TDP

on SHA 3 it can do even lower voltages and higher clocks

but on 1306 Mhz it will be around 260,000kh/s
with riddiculous low TDP.
i dont remember the exact number , so i can't say anything for sure.

but it was way way lower then scrypt mining .
lower then 80% at least

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