AMD takes Intel head on in Celeron Sempr0n match
 

Oh, yes, you'll need a BIOS change for the Sempron in motherboards that support it.

How the heck do you tell a Sempr0n from any other socket A CPU? The answer is you can't because the CPUID won't give you a clue. You can also bung them into MP systems, if you were wondering

http://www.theinquirer.net/?article=17261