What power supply req to Sli 2 x 260 GTX

[SGTBASHIR]

what is the recommended power supply to run 2 x Gainward Geforce 260 GTX Golden Sample cards?

 

[ko888]

For a system running with two GeForce GTX 260 graphics cards in 2-way SLI mode a power supply with a minimum 650 Watts or greater with a maximum combined +12 Volt continuous current rating of 51 Amps or greater and with at least four 6-pin PCI-E Supplementary Power Connectors is recommended.

The combined +12 Volt continuous current rating of 51 Amps or greater specification is the most important to meet not the power supply's total wattage.

 

[jsc]

You don't need that much power.

Pair of GTX260's: 22 - 25 amps.
OC'd CPU: 10 amps.
Rest of system: 100 watts.

That's about 500 watts. Add 10% for Mr. Murphy (of Murphy's Law fame ).

So bare minimum - a very good 550 watt PSU.

Practical minimum is a 650 watt PSU. Unfortunately, most 650 watt power supplies only have 2 PCIe cables.You could always use adapters, but I do not like adapters.

Seasonic makes the only 650 with 4 PCIe cables:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151088
And it is a little expensive.

I'd use something like a Corsair TX750V2:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021

 

[ko888]

My mistake. I was basing my calculations based on the older 65nm fab process GPU that consumes more power than the 55nm - 216 SP GPU that the Gainward GTX260 896MB GS uses.

In the worse case power scenario (e.g. running FurMark or OCCT GPU stress test) using a single 65nm version GTX 260 graphics card may draw up to 15.5 Amps from the +12V rails. The 55nm version may draw up to 14.0 Amps.

Under a gaming graphics load a single 65nm version GTX 260 graphics card may draw up to 12.92 Amps from the +12V rails. The 55nm version may draw up to 10.92 Amps.

Overclocking the GPU will, of course, increase the power consumption.