I'm volunteering at a high school and there's some GX620's with Pentium 4's and 3 classrooms with a set of them. The district doesn't want to spend the money on technology so I'm trying to extend the life out of them since they're newer. I researched that the Opitplex GX620's have NX bit. I saw a few fourms running with them running Windows 8. Some of them have Pentium D's. I'm wondering that can a Opitplex GX620 with a Pentium 4 have NX Bit and run Windows 8 or Does it have to have a Pentium D to run Windows 8?? I hope I can upgrade to Windows 8 with the Pentium 4 intact?? If it has to have a Pentium D, then I'll put Windows 7 because the processor upgrade would be very expensive. Thanks, Any Helpful Answers Would Be Appericated:) I'm new to this fourm.