First Build - Need Help

[LockBoxes]

Case: COOLER MASTER ELITE 335 RC-335-KKN1-GP Black SECC Steel ATX Mid Tower Computer Case
Power Supply: OCZ ModXStream Pro OCZ600MXSP 600W ATX12V V2.2 / EPS12V SLI Certified CrossFire Ready 80 PLUS Certified Modular Active PFC Power Supply compatible with core i7
Motherboard: ASUS M4A785TD-V EVO AM3 AMD 785G HDMI ATX AMD Motherboard
CPU: AMD Phenom II X2 555 Black Edition Callisto 3.2GHz 2 x 512KB L2 Cache 6MB L3 Cache Socket AM3 80W Dual-Core Desktop Processor - C3 Revision
RAM: G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL
Hard Drive: Western Digital Caviar Black WD7501AALS 750GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Hard Drive -Bare Drive
GPU: SAPPHIRE Vapor-X 100283VXL Radeon HD 5770 1GB 128-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card
DVD/CD Drive: LITE-ON Black 24X DVD+R 8X DVD+RW 8X DVD+R DL 24X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA CD/DVD Burner - Bulk - OEM

This is my first build and I have questions about my build.
Are all the components compatible with each other?
Will they work okay together?
Can this run Windows 7 Ultimate 64-bit?
I eventually plan to crossfire two 5770s and maybe upgrading to a Phenom II X4 or X6.

[Tumbleweed36]

First of all, you will be very lucky if that power supply will pull even one of those video cards (I would not try it if it were mine), and you speak about two, no way do you want to try that. I would use a 650 Corsair or Seasonic as a bare minimum for one of those cards (I would use 750 if you plan on any overclocking) and if you want two, then think bigger like an 800 to 850 watt of the same brands.

[Doby]

Dido on the psu, personally I don't care for ocz psu's anyway. Everything else looks good and it runs windows 7 perfectly even with on board video

[hhnq04]

Another nod for a Corsair / Seasonic PSU. Stick with 1 card, you'll get maybe 20% increase at best, at double the cost, with twice the power consumption and increased heat. 1 powerful card > 2 lesser cards.

Might as well get a Phenom II x4 now if you're planning on doing it, $50 difference now, $150 if you do it later. The 945 and 955 are both solid CPU's at a fair price (about $150).

[Tyree]

Same advice as above. Use one 5770 and a minimum 650W Corsair or SeaSonic PSU.