The power requirements for the EVGA 9 series graphics cards are as follows:
9800GX2 models
Minimum of a 600 Watt power supply
(minimum +12 Volt current rating of 28 amps)
An available 6 pin PCI-E power and 8 pin PCI-E power connector
9800 GTX+ models
Minimum of a 450 Watt power supply.
(minimum +12 Volt current rating of 26 amps.)
Two available 6-pin PCI Express power dongles
9800 GTX models
Minimum of a 450 Watt power supply
(minimum +12 Volt current rating of 24 amps)
Two available 6-pin PCI Express power dongles
9800 GT models
Minimum of a 400 Watt power supply.
(Minimum +12 Volt current rating of 26 amps)
An available 6-pin PCI Express power connector
9600GT models
Minimum of a 400 Watt power supply
(minimum +12 Volt current rating of 26 amps)
An available 6 pin PCI-E power connector
9600GSO models
Minimum of a 400 Watt power supply
(minimum +12 Volt current rating of 22 amps)
An available 6 pin PCI-E power connector
9500GT models
Minimum of a 350 Watt power supply
(minimum +12 Volt current rating of 18 amps)
9400GT models
Minimum of a 300 Watt power supply
(minimum +12 Volt current rating of 18 amps)