Review Index:

Galaxy GeForce GT 640 GC 1GB DDR3 Review - GK107 is no GK104

Manufacturer: Galaxy

The GK107 GPU

With the release of the Kepler architecture in March of this year, NVIDIA has once again seemed to take back the hearts of PC gamers with a GPU that is both powerful and power efficient. The GK104 has seen a product implementation as the GTX 680, the dual-GPU GTX 690 and most recently as the GTX 670. With a price tag of $399 though, there is still a very large portion of the graphics card market that Kepler hasn’t touched but is being addressed firmly by AMD’s Radeon 7000 series.
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Today we are going to be taking a look at NVIDIA’s latest offering, the sub-$100 card known as the GeForce GT 640 based on a completely new chip, the GK107. Specifically, we have the Galaxy GeForce GT 640 GC factory overclocked card.
Compared to the GK104 part, GK107 is a much smaller chip and the GT 640 implementation of it contains two SMX units and 384 CUDA cores. That is a significant drop off compared to the GTX 680 (1536 cores) and the GTX 670 (1344 cores) but it should really come as no surprise to those of you that follow the NVIDIA GPU families of the past.  The chip will have 32 texture units and 16 ROPs. 
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GK107 uses a 128-bit memory bus and in this case we are seeing cards shipping based on GDDR3 memory. Reference clock speeds for the GT 640 are 900 MHz on the core and 900 MHz for the memory.  While you will surely see some overspeced memory allocations from other AICs down the road, our tested model includes 1GB of frame buffer and will likely be the standard.  (Note: the NVIDIA reference guide actually shows a 2GB frame buffer.)
We are told by NVIDIA that this is the FULL GK107 chip with 384 CUDA cores and the chip has a total TDP of 65 watts.  Transistor count is 1.3 billion.
To be fair, selling for under $100, we shouldn’t expect too much out of the GT 640 in terms of performance and we still have likely products like the 660 and 650 to bridge the WIDE gap between $100 and $400 but let’s take a quick look at Galaxy’s implementation of this new GPU. Still, the specification drops here for this SKU are significant and right away we were worried how NVIDIA’s new card would stand up to the competition from similarly priced discrete GPUs from AMD.

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June 21, 2012 | 03:53 AM - Posted by Anonymous (not verified)

If this is not a complete waste of a card i dont know what is. looks like im buying a 6770... or an ageing 450...

June 21, 2012 | 10:18 AM - Posted by HM (not verified)

did you try some overclock on this card? particularly the core,
this card as it is is far from a good choice at its price point, BUT with DDR5 and a higher clock it could probably compete well with the 550 Ti,
and that's one of the reasons why I think there is no GT 640 DDR5 right now... high demand for gk107 on mobile and OEM!? and still significant stocks of old gf106 stuff for sale (GTS 450, GTX 550 Ti)?
it's the only explanation I can see...

June 21, 2012 | 10:14 PM - Posted by God (not verified)

Would this make a good dedicated physx card?

June 23, 2012 | 07:08 AM - Posted by rrr (not verified)

Damn, that's pretty bad.

June 30, 2012 | 09:36 PM - Posted by Raghar (not verified)

Where is comparison to GT 440? Comparing GT 640 to GTS 450 is like comparing GTX 550 TI to GTX 460.

BTW can you post synthetic from CUDA-Z, I'd like to see if float to double precision, and float to integer, ratios are the same as on GF 104.

July 4, 2012 | 06:59 AM - Posted by rrr (not verified)

If prices are as they are now, this is a perfectly valid comparison.

July 14, 2012 | 01:51 PM - Posted by Bertisevil (not verified)

You wouldn't believe the amount of DDR5 GTS 450's & gen 2 460's im selling. Hell, the DDR5 440's outsell the 610,620 etc. 5-1.

GTS450 and the slim 550's are VERY popular for (ATX) HTPC use right now. With the exception of the 670,680 the entire 600 line is a total dud thus far..At least that what the consumers are saying with their wallets.

August 7, 2012 | 08:17 PM - Posted by Marcus (not verified)

One good use for the GT 640 - works OOB in a Mountain Lion hackintosh. Much faster than integrated HD 3000

August 12, 2012 | 02:34 PM - Posted by Anonymous (not verified)

Which GT 640 did you use? The one reviewed here?

October 1, 2012 | 07:36 PM - Posted by Brian (not verified)

Hello guys, just wondering how does this card comapre to the nvidia gt240 i have with 1 gb ram looking to boost the graphics a has to fit into a hp case at the moment so i cant do a big card and the other limit im having is my 350 watt power supply,are the cuda cores the most important thing to look for or clock speed ?? thanks

December 26, 2012 | 09:43 PM - Posted by Anonymous (not verified)

If your on a budget and cant upgrade PSU

Galaxy - GeForce GT 440 1GB DDR3 PCI Express 2.0 Graphics Card

Is about as good as it gets.

I dont recommend buying the 640 if your PSU is rated at 350, because its pushing it, your system uses some of that 350 up already. It might be fine, but might not be either.

December 26, 2012 | 09:40 PM - Posted by Anonymous (not verified)

Its a valid review, but its missing the big sellingpoint of the NVIDIA 640.

Its a little faster then the 440 or 450 and It uses 350w power vs 300w power.

If your on a budget, don't really game, maybe only play one game like WOW or Diablo III. This is an amazing card.

I really didnt want to spend 200$ and buy a 150$ card + a new PSU just for 20~ fps

This is perfect for modded minecraft and a bit of light work in blender and other art programs.

January 4, 2013 | 06:50 AM - Posted by Roger Willington (not verified)

I am happy with this graphics card but I am no expert. I can run Starcraft 2 on Ultra settings and Train Simulator 2013 on High settings. Milkdrop looks great. I can't run everything at full hd but it runs quietly.

January 14, 2013 | 01:07 PM - Posted by Anonymous (not verified)

Can the GT 640 support 3 displays out of the box without any active adaptors?

January 22, 2013 | 10:56 AM - Posted by Anonymous (not verified)

You guys have absolutely no idea what you're talking about.

This card could easily run any game you throw at it at modest resolutions on medium to high settings.

Unless you're playing on a 40 inch display or multiple 20 - 30 inch displays, you're not going to be able to tell the difference visually between high and ultra in 90% of the games out there.

The GT 640 (And the GT 440) are probably two of the best budget cards on the market from NVidia.

March 22, 2013 | 11:10 AM - Posted by Anonymous (not verified)

I agree the GT440 DDR5 is one of the most underrated cards, Ive been using it for a couple years now and have it overclocked to almost 900 mhz and it plays all of my games well, not everyone has the money for the high end cards, Im gonna try this card out soon.

April 5, 2013 | 12:12 AM - Posted by Getz (not verified)

I just picked this card up a week ago or so for about 80 dollars at my local best buy. I'm running an aged Core 2 Duo 2.13gh and a limited 375watt psu. I was originally using a GeForce 9500GT...I am in that realm where I don't have money to throw out on a whole bunch of crap for a PC right now - - but I needed a little extra horsepower to play games like Tomb Raider and such. 6 or 8 months from now - -I may be in a better situation...but for now - - I had limited options and took a gamble on the 640 (This exact card, incidentally). So far, it rocks. Paired with this older processor and such...I don't really notice any of the "limitations" drawn from only having DDR3 ram and such. I am not rocking a Core i7 in this thing. I have a Core i7 machine back home with my parents that is running a 560 Ti - but i'm in Virginia..that thing is in Florida - - gotta do what I can with what I got. I'm also running on a 1280x1024 display, so I don't have super high resolutions to try and run at either. And oddly I can play Battlefield 3 Campaign with my presets from my Core i7 machine which are all Ultra. Don't really know why it's playable or if it's just a bug, but it seems to work just fine and without any really noticeable lag, will have to load up fraps and check the framerate. But in the end, for anyone with technical restraints and monetary restraints, I can say that this card is worth it... If you can get it under 100 dollars - - it's definitely worth it, and even more so if on an older machine like me.

December 2, 2013 | 10:35 PM - Posted by Anonymous (not verified)

can the galaxy geforce gt 640 support 300w psu?

February 3, 2014 | 02:25 AM - Posted by Josh from Georgia (not verified)

Yes, it can, very suprisingly. Just expect to make a few tradeoffs.

I originally bought this exact card from Best Buy to put in my aging Dell machine on a Pentium 4 3ghz with 4gb of DDR2. FAR from modern modest specs, but I was on a budget.

Recently I upgraded to a budget gaming desktop (Also from Best Buy), the Gateway DX4885, which has a 3.16 ghz Core i5 with 8gb of DDR3. I got the system home and found out that they used a BTX Power Connector with a meager 300w supply, which makes upgrading next to impossible without changing the motherboard or buying from Gateway directly. I plan to eventually change out the board for something mainstream with more features, with an ATX connector, since the case itself is a regulard ATX case with a non-standard motherboard and supply. I have a 450w supply I had only recently purchased when the supply died on the replaced machine.


The GT640 would not boot without disconnecting the DVD drive, due to lack of power wattage. Howevever, removing power to the DVD drive (which I rarely need anyway) left me with enough wattage to power both the graphics card, and to also use the dvd SATA and power connectors for an extra notebook-size 1.5 TB HDD.

October 28, 2014 | 02:58 AM - Posted by Ligrabonda2 (not verified)

Ive owned this card more than a year and can tell u that any game is playable comfortably provided shadows and anti-aliasing are disabled or lowered.

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