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AMD A8-3850 Llano Desktop Processor Review - Can AMD compete with Sandy Bridge?

Author: Ryan Shrout
Manufacturer: AMD

CPU and GPU Power Consumption Comparisons

CPU Power Consumption

For our power consumption testing we decided to approach it from two different angles.  First, the standard CPU-based power consumption that will see how the x86 cores in the AMD A8-3850 APU compare to the Core i3-2100 at both idle and load conditions.  Idle was taken at the Windows desktop after about 2-3 minutes of inactivity with all power savings options in the BIOS enabled.  The load power consumption numbers were taken from running CineBench 10 in its multi-threaded mode to max out all available CPU cores.  

A note on the results: both of the top two results (the AMD A8-3850 and the Core i3-2100) were taken WITHOUT the GTX 275 discrete graphics card installed.  The others DID have the card installed.  

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Idle results for the A8-3850 compared to the Core i3-2100 are pretty good with the AMD APU using less energy at this point.  The load conditions aren't as good with the APU pulling down an additional 49 watts in CB10.  Considering the APU is supposed to be a 100 watt part and the Core i3-2100 is a 65 watt CPU, those are larger than expected gaps.  

And if you take a look at the AMD A8-3850 compared to the Sandy Bridge based Core i7-2600K, it uses nearly as much power and it does not have a discrete GPU installed while the 2600K does.  Despite the poor x86 performance of the A8-3850 APU it seems to be using a lot of power while falling behind.  

GPU Power Consumption

Next we will look at the power consumption of the integrated graphics on both the A8-3850 and the Core i3-2100.  For this we used Left 4 Dead 2 which is actually a good game that pushes both the GPU and the CPU and thus this should represent a "complete" load on each of the processors.  While I am sure the CPU and GPU portions of each part are not fully maximized I imagine this is about close as it will get in the real world.

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At stock settings and 1333 MHz memory speeds, the AMD A8-3850 based system uses a total of 41.4 watts more power than the Core i3-2100 running the same game.  Obviously, the performance of L4D2 is world's better on the AMD system than on the Intel Core i3 but that performance does come at the cost of power.  In my estimation though (and surely everyone else's) that extra power is more than efficiently utilized in that 3x improved frame rate. 

Also, in case you were curious about how power consumption changed as the memory speed increased on our AMD APU system, you can see those results as well.  Even at the extremes we only saw a 3.6% gap in power draw.

With the discrete Radeon HD 6670 installed and running on both the Core i3-2100 and AMD A8-3850 (without Dual Graphics enabled) the AMD system used a total of 31 watts more power getting us closer to that 35 watt rated difference between the two processors.

October 31, 2011 | 08:11 PM - Posted by Bovinebill (not verified)

I think you have missed the whole point of buying an a-series APU.

If you want better performance that what the inbuild 6550 and a pci 6670 card will give you, then just dont bother buying the A-series APU.

Get yourself a decent AMD X4 or X6 chip instead and a motherboard that support AM3 chips.

These chips are faster the the A-series and will team up better with the higher end graphics cards.

November 18, 2011 | 07:33 AM - Posted by Anonymous (not verified)

This review is bullshit.
You can't overclock llano more than 3-5%
All you are doing is changing a number with your "overclocks", benchmark and see.

December 14, 2011 | 03:37 AM - Posted by Jhangir (not verified)

This processor is perfect for me. Low price and reliable performance. and discrete level dx 11 and grafichs.

December 18, 2011 | 03:21 AM - Posted by Kaupo (not verified)

this is the future of protcessors!

January 11, 2012 | 12:02 AM - Posted by Anonymous (not verified)

I just installed an amd a8-3850 processor, and i was wondering what is the best discrete graphics card to use dual graphics with my cpu. i have been looking at the Visiontek 900485 Radeon HD 6670 Video Card.

appreciate any help :)

January 11, 2012 | 01:08 AM - Posted by Anonymous (not verified)

im thinking the most likely card i will buy is the DIAMOND 6670PE32G Radeon HD 6670 2GB 128-bit GDDR3. its a little bit cheaper. and more likely to fit in my case

January 21, 2012 | 01:50 PM - Posted by Anonymous (not verified)

I don't think that card will work in Crossfire X. I just got it today, and have spent literally hours trying to get it to Crossfire with A8-3850. I have all drivers installed and still cannot enable the Crossfire on AMD Vision Control Center. I am pretty savvy, but cannot figure it out. Diamond doesn't even list this card on their site anymore. Think they are running from this problem, instead of tackling it!

September 24, 2012 | 04:25 PM - Posted by geniusthmaster (not verified)

hey my bios doesnt have those options im running a laptop and i need to undervolt and overclock. can u shed some help? i may consider attempting e the fact flashing your bios over mine, despite the fact that ill most likely render my pc useless.

September 24, 2012 | 04:26 PM - Posted by geniusthmaster (not verified)

hey my bios doesnt have those options im running a laptop and i need to undervolt and overclock. can u shed some help? i may consider attempting e the fact flashing your bios over mine, despite the fact that ill most likely render my disfunctional. or do u have other suggestions etc etc?

September 24, 2012 | 04:55 PM - Posted by geniusthmaster (not verified)

just thought you would like to know, did some cusstomizations based upon my ELITE settings within my dell vostro core 2 duo westwood 1500 dell intel laptop, and i got this toshiba satellite 8100xlr8x to achieve stable all 4 cores at a 2464 Mhtz, the temparute gain without fan speed control is 1 c per second, the modification are thus:
volt rail 1 at 1.0063

volt rail 2 at 1.0437

turbo core disable

multiplier at 19x

system score on full benchmark :: 6436

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