I have one of these computers, already, with this i7 3770 CPU and 8 GB RAM and 500 GB h-drive, running Windows 7. It is the best computer I've ever used, far and away. It is quiet, super reliable, and super fast. I bought mine from a different source, 3 years ago. I just wanted to post a recommendation for this computer. (If I didn't have so many computers already, I'd buy this one.) I've had really good luck with refurbished HP computers.