NZXT PHANTOM FULL TOWER CORSAIR H80 AMD PHENOM II 1090T OC'D TO 4.0 GHZ CROSSFIRE 6850'S 8GB KINGSTON HYPER X RAM 64 GB SSD 500GB HDD 6 CASE FANS
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More aboutwill power supply power system crossfire
For a system using two Radeon HD 6850 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 600 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 35 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.
The Corsair Builder Series CX600 V2 (CMPSU-600CXV2), with its maximum +12 Volt continuous current rating of 40 Amps and two (6+2)-pin PCI Express supplementary power connectors, is enough to meet the minimum recommended power requirements for a system using reference clocked CPU and GPUs.
Overclocking of the CPU and GPUs will, of course increase, the +12 Volt power requirements.
^....And since you only have 5 extra amps I would go with a slightly larger PSU. -Bruce