If my old desktop PC has a Pentium D CPU in it now, can a be pretty certain a core 2 duo E7500 will work in it?
It used to be same socket (both are socket 775 I'm told) means they're compatible; I'm hoping I can just pop one out and the newer one in and it'll work (although the newer CPU may be limited a bit by the Motherboard's FSB speed).
I don't have a manual for the motherboard so I can't check that or Google it to check compatibility.
Update: As suggested, I used CPU-Z to get the MB model number and looked up the CPU compatibility chart on the manufacturer's website. Problem solved. No luck for upgrading, though - the CPU I already have is the max for this mainboard.