2nd CPU on PowerEdge 2950

I'm looking to add another CPU to my PowerEdge 2950. It currently has a Xeon DP 5080 @ 3.73Ghz Stepping 4 Rev C1.

Do I need to match the stepping with the 2nd cpu or can I run the same processor model with a different stepping number?

Thanks!

just started reading about it , seems as long as the cache is the same