Increasing the performance

Talking about a better cpu: Intel released a unlocked haswell dual core (Pentium g3258) for like 70 dollars. Would be an amazing cpu for emulation if you are on a tight budget. I don't know how many cores rpcs3 uses, though.

Running just Disgaea 3 I would say at least a quad core with hyperthreading would be a good start Not that any CPU would be fast enough.

I looked it up and apparently rpcs3 can use up to 9 cores.. pretty sick.. all other emulators i know only use 2 or 3 at most. So in that case the g3258 wouldn't be that good indeed.