I'd like to give my system a good old boost. i have 2 x 8800 gtx's in sli which i'm happy with but i'd like to replace my e650 with something a bit more powerfull deff quad. Current board is MSI p6n SLI V2. Any suggestions for cpu upgrade are very welcome indeed. Cheers guys Max.
The very best socket 775 CPU is the Core 2 Extreme QX9770 as Raidur said. The best value CPUs would be the Core 2 Quad Q8400 as Enzo mentioned or the Core 2 Quad Q9550 only if you can manage to get it from Micro Center.