Somewhere on the motherboard it will tell you the name of it. If you don't feel like looking, then you can download this program:

SiSoftware - Tells you everything you'd need or want to know about your computer hardware.
http://www.sisoftware.net/index.html...uy&langx=en&a=

edit: also to look for compatible CPU's, go to the main site of who ever produced the motherboard your using, and search for it. It should then have a list somewhere of all the compatible CPU's.