I just build a new system with EVGA X58 SLI Motherboard w/ core i 7. I current have 3 1 GB RAMs and I have slot more available slots and I have 1 EVGA GeForce GTX 295. Now I am planning to install the windows 7 so I want to know which would be better for the system. The X64 or X86 and can anyone please explain the difference between the two for my. I have no idea.