Help choose one of these two Corsair PSUs

[xbonez]

Here are my system specs:

Processor: Intel Core i7 920 2.66GHz
Motherboard: EVGA 132-BL-E758-A1 X58 3-Way SLI Core i7 Motherboard
RAM: Corsair XMS3 3x2GB Tri Channel 1600Mhz
Graphics: HD 5850 Crossfire (if availability improves) or GTX 275 SLI
HDD: 2 x 640GB WD Caviar Black (RAID 0)
Chassis: Antec 1200 (comes with a whole bunch of fans)

Apart from this, I have the usual peripherals: Blu ray drive, sidewinder X6 gaming keyboard, mouse, 1Tb external HDD etc etc.

My PSU choices:

http://www.amazon.com/Corsair-CMPSU-750TX-750-Watt-Certified-compatible/dp/B000X2677A/ref=wl_it_dp_o?ie=UTF8&coliid=I2SLWJI5RPPD5M&colid=5M276FD91BY3

AND

http://www.amazon.com/Corsair-CMPSU-850TX-850-Watt-Certified-compatible/dp/B001M3G42W/ref=wl_it_dp_o?ie=UTF8&coliid=I12MU0UALEUS5N&colid=5M276FD91BY3


Which one do you suggest?

 

[JohnnyLucky]

Here are the official power requirements for the brand new ATI Radeon HD 5850 and HD 5870 video cards.


ATI Radeon™ HD5850 System Requirements:

PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard

500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended

600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode


ATI Radeon™ HD5870 System Requirements:

PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard

500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended

600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in • dual mode

The power supply recommendations are for an entire pc system.

Note - 40 amps for the 12 volt rail(s) and a grand total of four 75 watt, 6 pin PCI-e psu power cables for dual Crossfire.

 

[xbonez]

well, bot the Corsair PSUs seem to fulfill the requirements. Both come with 4 6-pin PCI-E power connectors.

I dont' think I'll be needing 850W anytime soon, so I guess I'll go for the 750W PSU. Seems to be enough for now and with a certain amount of future proofing.

Thanks JohnnyLucky

 

[JohnnyLucky]

You're welcome!