Depends on what it is. The i5 2500K and to a lesser extent the i7 2600K are starting to get aged but they can still run newer games fairly well. Slap a decent GPU with one of those and you're pretty much set.
It's about 7 years old and only has a dual core CPU. I've had it for a while but it cost me nothing.
Spent nothing on it. It isn't worth anything.
It doesn't even have a graphics card.