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Frontpage Slideshow | Copyright © 2006-2010 orks, a business unit of Nuevvo Webware Ltd.
Friday, 22 October 2010 17:38

XFX HD 6850 and Radeon HD 6870 have arrived - 6. Overclocking, Temperature, Consumption

Written by Sanjin Rados
thumb

Review: Goes over 1GHz


HD 6800 Overclocking

HD 6870’s reference clocks are 900MHz for the GPU an 1050MHz for the memory, and our today’s XFX cards use reference design. CCC Overdrive limits the clocks to 1000MHz for the GPU and 1250MHz for the memory, so we relied on MSI’s Afterburner for our overclocking. We managed to hit 1010MHz for the GPU but only after we increased the fan RPM to 55%, where the fan ran pretty loud.

We managed to hit 990MHz for the GPU and 1100MHz for the memory by running the fan in AUTO mode, and it resulted in 8% better results in Aliens vs. Predator. Had the HD 6870 been just a tad bit louder during our tests (AUTO fan mode), we’d call the card loud, but it still isn’t unbearable.

On the other hand, the card is quiet when idle.

xfx_6870_GPUz_OC


XFX HD 6850 is also a reference clocked card – the GPU runs at 775MHz, shaders at 775MHz and the memory at 1000MHz (4000MHz effectively). The card allowed an overclock to 930MHz GPU and 1180MHz for the memory and it resulted in 18% better results in Aliens vs. Predator.

xfx_6850_GPUz_OC



Fan noise

XFX HD 6870 is pretty quiet when idle, and it doesn’t get loud during gaming either.

The XFX HD 6850, on the other hand, gets loud both when idle and when gaming and it is definitely louder than XFX HD 6870. The BIOS sets the fan to 42% RPM in idle mode making the card pretty loud. Furmark testing caused the XFX HD 6850 temperatures to go up to 65 degrees Celsius, which speaks volumes on the cooler's quality. Furthermore, it also means that you can sacrifice a couple of C and make the card quieter.

xfx_6850_GPUz_idle

XFX HD 6870 didn’t go over 84°C during our tests. The cooler was almost inaudible in idle operation (43°C), and while it gets louder in FurMark tests, it isn’t too loud. Of course, fan speed can be controlled via Catalst Overdrive.

Consumption

Faster cards usually have two 6-pin PCIe power connectors but the HD 6870 had to have two. A single Watt that is the culprit, as the card will draw 151W while one connector can supply “only” 150W. However, the additional power connector allows for overclocking beyond 900MHz.

The slower HD 6850 comes with one 6-pin power connector. As you probably already know, Barts XT and PRO chips’ die size measures 255mm2. HD 6870 consumes 19W in idle and 151W during operation whereas the 6850 draws 19W when idle and 127W during operation.

We measured our entire rig's consumption after stressing the graphics with FurMark. The tests show that HD 6870’s consumption is similar to the GTX 460 1GB.

6800_power
(Page 6 of 7)
Last modified on Sunday, 09 January 2011 17:36
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Comments  

 
+19 #1 Nubstick 2010-10-22 18:59
"Power Consumption"
"higher is better"

It all makes sense now.
 
 
+14 #2 Nerdfighter 2010-10-22 19:14
Nice review, but oddly enough, the results seem to be quite different. In the other review I read, the 6850 beat the 1GB 460 in almost every benchmark, and the 6870 beat the 5850 in almost every benchmark. Here it seems to be the opposite. Confusing.
 
 
+16 #3 MrScary 2010-10-22 19:39
6850/6870 wiped the floor with 460 (even ultra gay FTV evga):

http://www.anandtech.com/show/3987/amds-radeon-6870-6850-renewing-competition-in-the-midrange-market/8

enuf said.
 
 
+12 #4 MrScary 2010-10-22 19:43
Quoting Nubstick:
"Power Consumption"
"higher is better"

It all makes sense now.

Hahaha :D , thats a post fermi sindrome for preaching too much about the wonders of founding nuclear plants thanks to fermi power consumptions, but remenber boys, nvidia is gut, more powerrr hungry. yum yum. hotterrrrr.
 
 
+10 #5 MrScary 2010-10-22 19:46
I recomend to see the reviews from anadntech and techpowerups, fudworld is on another dimension, all the scores are biased.
 
 
+6 #6 MrScary 2010-10-22 19:51
Quoting Nerdfighter:
Nice review, but oddly enough, the results seem to be quite different. In the other review I read, the 6850 beat the 1GB 460 in almost every benchmark, and the 6870 beat the 5850 in almost every benchmark. Here it seems to be the opposite. Confusing.

They are biased, is normal in fudzilla world, but hold to reallity: http://www.anandtech.com/show/3987/amds-radeon-6870-6850-renewing-competition-in-the-midrange-market/8
 
 
+6 #7 MrScary 2010-10-22 19:53
Quoting Nerdfighter:
Nice review, but oddly enough, the results seem to be quite different. In the other review I read, the 6850 beat the 1GB 460 in almost every benchmark, and the 6870 beat the 5850 in almost every benchmark. Here it seems to be the opposite. Confusing.

And remember, reading AMD reviews on fudzilla is just for the joke, stick with pros like techpowerups, anand tech (on starcraft 6850/6870 wiped the floor with fermi).
 
 
+8 #8 hellfire 2010-10-22 19:56
Quote:
while Radeon HD 6970 is priced about $30 higher than the GTX 460 1G


Cayman review on its way? :lol:
 
 
-23 #9 HiTechpro 2010-10-22 22:01
http://www.anandtech.com/show/3987/amds-radeon-6870-6850-renewing-competition-in-the-midrange-market/11

AMD loses again again
to the mighty nVidia
:D :D :D

http://www.anandtech.com/show/3987/amds-radeon-6870-6850-renewing-competition-in-the-midrange-market/10

nVidia a clear winner 8)
 
 
+14 #10 Nemtrac 2010-10-22 23:09
So, such pricing, performance and potential make it virtually impossible for us not to recommend XFX’s HD 6870 or HD 6850 cards.

Hmmm Hard isn't it.

50 tumbs up ;)
 

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