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I actually just ordered this card the other day, and I'm doing some tests on it tonight, so if you can hold off, I'll tell you my environment variables, and what the best scores I could come up with were

My system stays pretty cool, so yeah, this'll be a fun challenge
 

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Just an update...
I forgot that I'd told you that I was getting the card (distracted by attempting overclocks, etc.)

I just re-did a new burn in for a second one of these cards tonight, and am going to be testing some different clocks, but one thing that I can tell you off the bat is that the voltage is locked, so there's going to be issues with it immediately just because of that.
So far I've gotten it to run at 850core, and 1150mem stable, but I'm not sure what else will be accomplishable. I'll update you more later as I come across data.

Sorry for the late response.

Here's my entire system Setup, as well as temps under different conditions.
Hope this will help you in your decision
¤Case: http://www.newegg.com/Product/Product.aspx?Item=N82E16811322021

¤Motherboard: http://www.newegg.com/Product/Product.aspx?Item=N82E16813130590

¤ CPU: AMD Athlon II X4 640 Overclocked to 2.3Ghz 1.367volts

Graphics Card HIS h685FN1GD HD6850 currently overclocked 850c/1150m stable with TX-4 Thermal Paste, and stock HS, and cooling fan.

CPU Cooler: Sunbeam Twister with default fans on full speed manual mode.

¤Fans: 4x http://www.newegg.com/Product/Product.aspx?Item=N82E16835200048

¤Fans 2: 1x Blue LED 120MM Fan (elecromagnetically powered by fan motor) 2x Regular Sentey Case fans with LED wiring desoldered (run a TAD faster, not much.)

¤Power Supply: http://www.newegg.com/Product/Product.aspx?Item=N82E16817171046

Disk Drive 1: Seagate Barracuda 1tb 7200RPM drive
Disk Drive 2: Western Digital Green Series 500gb Drive
Dvd Drive: Don't really remember the brand.

Keyboard: Logitech Acess 200 (Seriously can't beat this keyboard. Waterproof,a nd 24 programmable keys for under 30 bucks - Provided you can even find one anymore.)

Mouse: Logitech Anywhere MX DarkField Mouse with unifying receiver.

USB Devices: 1x I-Pen graphics pen, 1x Mouse, 1x KB, 1x Printer, 1x USB Power 92mm Fan that I have mounted to my desk to cool down my mouse hand - wired it myself, so it uses all 5 volts of the port, and another 2.5volts from a second port.)

==========================Temps==========================
Ambient Case temp Idle: 17-22c (22 was with my heater running and an 80F room temp)
Airflow Temp: 17c-22c
CPU Temp Idle: 23-25c
CPU Temp Load: 40c (almost no fluctation)
GPU Temp OC Idle: 45.0
GPU Temp OC Load 55-61c
GPU Temp Non OC: 36-59c
 

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Okay, the final reviews are in. After many hours of testing the max stable that I was able to obtain was the following

*NOTE* I ran it at these settings as these are typical fo my gaming sessions. The Aliasing in 1080 is so minimal I've never been concerned with it.
===========================
Overclocking Software Used: Sapphire Trixx
Monitoring Tools: Sapphire Trixx, and HWMonitor Pro
Benchmarking Program: heaven DX11 Benchmark V2.5
===========================
Benchmark Settings:
Render: Directx11
Resolution: 1920x1080 windowed
Shaders: High
Textures: High
Anistropy: 4x
Occlusion: Enabled
Refraction: Enabled
Volumetric: Enabled
Tessellation: Normal
===========================
Results:
Stock Clocks 775/1000/1.150volts
FPS: 29.1
Scores: 802
Min FPS: 18.1
Max FPS: 67.5
===========================
Results:
Overclocked 1000/1175/1.174volts
FPS: 39.1
Scores: 985
Min FPS: 27.1
Max FPS: 86.0
============================
Temperatures:
Temps fluctuated +/- 1 degree hence the ~ (About symbol)
Stock 775/1000/1/1.150volts
Minimum: ~35c
Maximum ~50c
Overclocked 1000/1175/1.174volts
Minimum: ~40c
Maximum: ~61c
Conclusion:

While these results may or may not be typical, I've provided all information necessary to achieve the same, if not better results.
I'm absolutely positive that with a higher power supply, high end motherboard, and third pary cooler you'd be able to achieve clocks higher than, if not the same as these with minimal modification to your system.

Good Luck Modders, and best wishes!
 
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