I need a new PSU and most popualar PSU at newegg are the 650-TX & 750-TX but neither have the ''2.91'' in there description is this important ? Do I need this ? The TX-850 & 950 both have it, but not the 650/750 ? I just built a new PC with a I7 & GTX460.
CORSAIR CMPSU-650TX 650W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply
CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply
CORSAIR CMPSU-850TX 850W ATX12V 2.2 / EPS12V 2.91 SLI Ready CrossFire Ready Active PFC Power Supply
CORSAIR TX Series CMPSU-950TX 950W ATX12V v2.3/EPS12V v2.91 SLI Ready 80 PLUS BRONZE Certified Active PFC Power Supply
CORSAIR CMPSU-650TX 650W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply
CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply
CORSAIR CMPSU-850TX 850W ATX12V 2.2 / EPS12V 2.91 SLI Ready CrossFire Ready Active PFC Power Supply
CORSAIR TX Series CMPSU-950TX 950W ATX12V v2.3/EPS12V v2.91 SLI Ready 80 PLUS BRONZE Certified Active PFC Power Supply