So I recently sold my ol' Coolermaster Real-Power M700, and brought a Corsair HX850 Power suuply, The main reason was because the old power supply made alot of noise (Coil Whine) which was extremely annoying.
Anyways I plan to go crossfire very soon and would like to make sure that My Corsair HX850 is enough. So below is my system spec's:
Gigabyte GA EX58-UD5
Core i7 920 @ 4Ghz (4.4Ghz for benching) 1.264V
3 x 1GB OCZ Triple Channel RAM @ 1200 7-7-7-21
Gigabyte HD5850's @ 1000/1200 1.225V X2
2 X 10W Pumps
A fan controller
DVD ROM Drive
Samsung Spinpoint F3 500GB
Corsair Obsidian 800D
Please take into consideration the fairly heavy OC's on the two cards and the core i7 920.
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)
Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products
Minimum 1GB of system memory
Installation software requires CD-ROM drive
DVD playback requires DVD drive
Blu-ray™ playback requires Blu-ray drive
For an ATI CrossFireX™ system, a second ATI Radeon™ HD 5850 graphics card, an ATI CrossFireX Ready motherboard and one ATI CrossFireX Bridge Interconnect cable per graphics card (included) are required
The recommended PSU is for the entire system, so, yeah ur current PSU is more that enough.