I'm running 2 6990's on a coolermaster silent pro 1kw bronze, it has an i7 920 & 12gb ram & 2 x 1tb sata drives. Its been running perfectly for over a month now and my cpu is around 85% 24/7, ram around 10gb. I have the cards in the overclocked position @ 920/600. I do need to plug my kill-a-watt in at some point because I know I'm right on the limit if not probably over with the amount of cpu/ram usage.
I don't think you have anything to worry about, the PSU is rated for something like 1200w burst, 1000w continual and it comes with a nice lengthy warranty.
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i don't personally own a 6990, but there seems to be some conflicting numbers on the power consumption. so is it 300w, 330w, 375w, or 450w? i think i read the reviews on these and it has a stock TDP of 300w, and there's a flip of a switch that will bring performance up, where it has a TPD of 450w.
when i said that 2x 6990 should be able to work on this 1000w, i just assumed it was 450w TDP, which a 1000w quality PSU should be barely enough since video cards never pass that power limit, even at 100% load on stock clocks.
when i said that 2x 6990 should be able to work on this 1000w, i just assumed it was 450w TDP, which a 1000w quality PSU should be barely enough since video cards never pass that power limit, even at 100% load on stock clocks.
Here are two reviews tested the 12v on the Coolermaster and it was within the 5% maximum variation (0.6v on the 12v rail) at beyond 1000w load:
http://www.bcchardware.com/index.php?full=1&set_albumName=CM1000WGold&id=AveVoltage&option=com_gallery&Itemid=96&include=view_photo.php
http://xtremetechjunkies.com/2010/07/cooler-master-silent-pro-gold-1000w-power-supply-review/
However, both reviews used PSUs supplied by Coolermaster so who knows if they were cherry picked. Jonnyguru reviewed a similar Coolermaster PSU and the 12V rail was dangerously close to the limit when the 3.3v/5v were mainly left unused, which you would be doing. He is a much more reputable source for PSU reviews. On the plus side, all reviews showed the efficiency was still good.
The 6990 uses about 375w each so with overclocking two will pull some juice. As sveetsnelda advised, keep overclocking down and you should be good.
http://www.bcchardware.com/index.php?full=1&set_albumName=CM1000WGold&id=AveVoltage&option=com_gallery&Itemid=96&include=view_photo.php
http://xtremetechjunkies.com/2010/07/cooler-master-silent-pro-gold-1000w-power-supply-review/
However, both reviews used PSUs supplied by Coolermaster so who knows if they were cherry picked. Jonnyguru reviewed a similar Coolermaster PSU and the 12V rail was dangerously close to the limit when the 3.3v/5v were mainly left unused, which you would be doing. He is a much more reputable source for PSU reviews. On the plus side, all reviews showed the efficiency was still good.
The 6990 uses about 375w each so with overclocking two will pull some juice. As sveetsnelda advised, keep overclocking down and you should be good.
I think so. You have a single +12V rail, so you don't have to worry where the power's coming from. And your power supply can provide up to 984W on that rail. Each card is rated for 330W max, so that would be 660W for the two cards. The remaining 300W should easily cover a minimal system.
With a quality power supply, you could probably get by with a 1000W PSU if you keep the memory clocks down. Underclocking the video RAM and undervolting the cards dropped 100 watts (at the plug) on each rig. 2x6990's will use a little less power than 4x6970's, but not by much. Another thing to consider is that a PSU is usually most efficient around 75% load. Coughing up the extra cash for more than a 1000W PSU might save some electricity in the long run.
I have to agree all you need is 1000 watts. A 6990 only requires around 300 watts so that's 600 from the cards. If you get a good 1000 watt power supply you'll never have any worries.
I have 8 rigs running 4x6970's in them. With the memory clocked down and the voltage dropped a little, each machine is pulling 1049W from the wall. This means that the PSU is probably seeing around 950W on the input side. These machines have AMD X3 445's in them with two of the cores disabled. Only one stick of RAM is being used. They are booting from a flash drive as well (no hard drive).
With a quality power supply, you could probably get by with a 1000W PSU if you keep the memory clocks down. Underclocking the video RAM and undervolting the cards dropped 100 watts (at the plug) on each rig. 2x6990's will use a little less power than 4x6970's, but not by much. Another thing to consider is that a PSU is usually most efficient around 75% load. Coughing up the extra cash for more than a 1000W PSU might save some electricity in the long run.
With a quality power supply, you could probably get by with a 1000W PSU if you keep the memory clocks down. Underclocking the video RAM and undervolting the cards dropped 100 watts (at the plug) on each rig. 2x6990's will use a little less power than 4x6970's, but not by much. Another thing to consider is that a PSU is usually most efficient around 75% load. Coughing up the extra cash for more than a 1000W PSU might save some electricity in the long run.
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