Dell did ship these with Phenom II-X4 CPUs, so most of the Socket S1-G4 CPUs should work. Stick to models with identical or similar power requirements - installing a CPU that requires more power than the original, is an invitation to system instability.

please help me some? i just bought a NEW alienware X51 yesterday and it works fine.. but today i accidently format my alienware without backup.. so is there any way that someone can give me the factory backup? how do i restore my alienware like it 1st came? i install everything on the CD but

I shut it down, and started it back up and the noise continued. I turned it off and left it for the night. When I started it up this morning, all was well, for about 5 minutes or so. Then the noise started again, and it will not stop.