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Author Topic: PSU for 2 x 6970 + 2 x 6990 (liquid cooled)  (Read 1779 times)
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June 22, 2011, 08:42:31 PM

Any ideas how big of a PSU I'll need for such a beast?
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June 23, 2011, 12:45:41 AM

Get a second motherboard is the only solution. You will most likely fry the pci express slots.

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June 23, 2011, 12:59:22 PM

Get a kill-a-watt.

I've been overestimating my power consumption before I bought a kill-a-watt. Before I bought my kill-a-watt, I estimated my systems to be consuming 1450w~, but really the two systems below pull 1100w together. Note that I undervolt and overclock my GPUs. I've tried to lower CPU voltage as well, but really you're not saving that much power.

1x i7 930 @ 2.8ghz 1.184v (3 cores disabled)
2x 5970 @ 750/300 1.00v (333 Mhash/ea)
3x 1TB Samsung F3
1x 90gb Vertex 2
2x 2GB DDR3
Xion 1250w

1x Sempron 140 @ 2.8ghz .95v
3x 5850 775/300 @ 1.00v (310 Mhash/ea)
1x 2GB DDR3
1x Random HD
PC Power and Cooling 610w PSU

2.262 Ghash for 1.1kW is pretty efficient.

[Selling] Delta 120mm Fans 130CFM 3 Pin w/ 3 pin to 4 pin molex + fan screws
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June 25, 2011, 01:33:35 AM

Get a second motherboard is the only solution. You will most likely fry the pci express slots.

Use extenders with molex to offload the slots or get a board built to support 4 x16 cards (specifically calling out triple SLI or quad nvidia) as it should be built to push the load.

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June 25, 2011, 01:43:19 AM

Do this
Required items
2x PSU
1x Electrical tape.
1x Wire stripers

Take the first psu that will goto the board and locate the green wire on the 4th pin and any ground
on the second psu do the same but cut the wires at the atx connector.

Strip the two wires on the 1st psu a bit so you can attach the power on and ground to them.
Seal splices and TADA. DUAL PSU
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June 27, 2011, 07:19:49 PM

This one should do it!   Cool

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