Solved Help choose one of these two Corsair PSUs Tags: Power Supplies Components Last response: October 23, 2009 9:03 PM in Components Share xbonez October 23, 2009 7:10:09 PM 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-Cert... AND http://www.amazon.com/Corsair-CMPSU-850TX-850-Watt-Cert... Which one do you suggest? More about : choose corsair psus Best solution JohnnyLucky a c 248 ) Power supply October 23, 2009 8:06:40 PM Share 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 October 23, 2009 8:29:04 PM 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 Can't find your answer ? Ask ! Get the answer JohnnyLucky a c 248 ) Power supply October 23, 2009 9:03:50 PM You're welcome! Can't find your answer ? Ask ! Publish Related resources Corsair vs XFX PSUs , who has the advantage? Forum Corsair PSUs . Are they over-hyped? Forum Two PSUS ? Is one enough? Forum OCZ, Thoughts on there PSUs , specifically this ONE !!! Forum Please Help : Deciding between two PSUs : Antec vs SilverStone Forum Which one of these two PSUs should I use? Forum Which PSUs to get for these two systems Forum Help choose between these PSUs Forum Need to Choose One of 4 PSUs . Help Me Narrow it Down? Forum HELP ME read the "specs" for TWO PSUs Forum Help me choose between two different builds. Forum Urgent tech support: 3 mobos, two graphics cards, two PSUs , same prb Forum Which of these PSUs would you choose ? Forum Choosing between PSus Forum More questions than i an fit in one line about PSUs and SLI Forum Is it true- PSUs run max efficiency at 40-60% Load? Forum Did I really get two bad PSUs ? Forum 212 evo fan replacement Forum Need help comp turned off and wont power up Forum [Solved] Corsair HX 1000W Help Forum More resources Read discussions in other Components categories Power supplies Sound cards NICs Akasa Antec Cooler Master Cougar DeepCool Enermax !