So I am in the process of building a gaming rig that will play any video game, but i also want it for cs3 purposes. I am wondering if all of this will be compatible with each other before i spend a large amount of cash on it to find out some of the parts aren't compatible with one another.
Case: COOLERMASTER HAF X
HDD: WD Caviar 1TB X2
GPU/Graphics card: 2x Nvidia GTX580
PSU: CORSAIR Professional Series AX1200 1200W ATX12V v2.31 / EPS12V v2.92 SLI Certified 80 PLUS GOLD Certified Modular Active PFC Power Supply
MOTHERBOARD: EDIT: ASUS Z8NA-D6 (ASMB4-IKVM) Dual LGA 1366 Intel 5500 ATX Dual Intel Xeon 5500 and 5600 Series Server Motherboard ASUS Rampage III Formula LGA 1366 Intel X58 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
I am pretty sure the i7-980 will not work on this board you will need to get the 6 core Xeon this is a workstation board. I took this from a forum
Yes, the Xeon 5500 series is the same Nahelam architecture as the i7 920 and up, but the Xeons do have a few more instructions that the i7s don't have. However this is not just a BIOS setting, it's what the chipset supports also.
The boards you linked have an Intel X58 chipset and the Asus Z8NA has an Intel 5500 chipset. The 5500 and 5520 chipsets do not support i7s, they support Xeons only.
However I'm not sure if the X58 chipset supports multiple sockets, I've only seen it on single socket boards; but they do support Xeon instructions and hence you see support for both types of CPU on those boards.
Best thing for you to do, if you plan on having dual procs in the future, is just start with one Xeon instead of the 920 (which is EOL now anyway I think)