d3v1ous :
okay so ur saying just get a mobo that supports the intel i5 and windows 7 and that is pcie 2.0 x16?
I should have added one other detail before, too. AMD will let you run their cards CrossFired in a x16, x4 - but Nvidia will not certify boards for running SLI that are x16, x4 because of the poorer performance/experiense the user will have.
I would look for a mobo with the P55 chipset that is CF and SLI certified because if it is certified CF and SLI then it will have two PCIe 2.0 x16 slots that, when both are populated, run at x8, x8. So to be safe look for:
1. P55 chipset
2. CF and SLI certification
3. Two PCIe 2.0 x16 slots that run in x8, x8 when both are populated