Question about using cores for emulating..

[slax65]

Hi folks,

I was wondering if it's possible to use all four cores I got for emulating, instead of just two ..
wouldn't I get a little speed-up?? Cause I have the Intel i7 930 @ 2,8 GHz and the Nvideo GTX 580,
most games are running in full speed .. I use SpeedFan to look after the temps of my hardware while playing and
I noticed, that the CPU is only 30% in use while playing ..