The power requirements for the EVGA FX series graphics cards are as follows:
5700 Ultra models
Minimum of a 300 Watt power supply.
(minimum +12 Volt current rating of 18 amps)
5500 Ultra models
Minimum of a 250 Watt power supply.
(minimum +12 Volt current rating of 18 amps)
5200 Ultra models
Minimum of a 250 Watt power supply.
(minimum +12 Volt current rating of 18 amps)