poliwaggamers :
So, I found a old server with dual Opteron 2376:s (quadcore) so with 8 logical cores. How would this translate into gaming performance?
Only if it is free, and you will accept 5 year old performance.
Daily, we see people here trying to make a 'server' into a gaming system.
Just because it is (was) a powerful system, does not make it powerful for all applications.
Similarly, you wouldn't take a good gaming system from 5 years ago and turn it into a database server.
Even worse are the ones who buy a thin blade server (Dell 2950, for instance), and then discover how LOUD they are.