Minimum of a 350 Watt power supply.
(Minimum recommended power supply with +12 Volt current rating of 18 Amp Amps.)
Minimum 400 Watt for SLI mode system.
(Minimum recommended power supply with +12 Volt current rating of 24 Amp Amps.)
The amperage is written on the side label on the psu.
For your setup, an Antec Earthwatts 380 would be an excelent choice.
------------------------------If the automobile had followed the same development cycle as the computer, a Rolls-Royce today would cost $100, get a million miles to the gallon, and explode once a year, killing everyone inside.
PSA
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