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Ati 6850 Crossfire - Compatible PSU's

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January 5, 2011 2:39:26 AM

Hey Folks!

I want to run two 6850's in Crossfire. However, im finding it difficult to find a certified PSU for the 6850's?


I really want to get the True Power Quattro 1000W, heaps of power, but when I go on the AMD compatibility site, it does not list the 6850's, BUT, it does list the much more powerful/intense 5970's in CF, as well as less powerful versions. Everything but the 6850's!

Heres the list:

http://support.amd.com/us/certified/power-supplies/Page...

So, did AMD simply not add it to the site, and is indeed compatible, or is it NOT?

Thanks in advance :) 
January 7, 2011 5:02:36 PM

Hey Jan, let me give you some advice. Most people over estimate the power consumption of their PC's.

I have two 4870's overclocked (consume more power than the 6850's)
overclocked 955BE (lots of power draw there)
8 GB RAM (4 x 2 GB)
8 HD's (4 in a raid 5, two in raid 1, 1 SSD and one 1.5 TB backup drive)
1 dvd burner
6 case fans
1 card reader

My system is drawing 500W from the wall as measured by a kill-a-watt meter. My PSU is rated at 82%, so my actual system power consumption is

500W * 0.82 = 410W. This is the idle power consumption.

Under load, (prime 95 on the cpu and boinc on the two graphics cards) my power usage increases to about 680W. That means my load system power consumption is

680W * 0.82 = 558 W.

Under normal circumstances, 550 W would be enough to power even my PC. You do not need a 1 kw psu! A quality 600-700 W psu is all you will ever need to power two 6850's. In fact, unless you are running tri-SLI with 580's, 700W is all you would likely ever need again.
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January 7, 2011 9:39:10 PM

I should have been more clear. I was trying to show him the system power consumption (as drawn from the PSU) vs the actual power consumption (as drawn from the wall), and I assure you they are correct.
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a b ) Power supply
a b À AMD
August 1, 2011 8:41:00 PM

This topic has been closed by Mousemonkey
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