Sorry, the Xeons are older, 5050 series. (3GHz, Dual Core, 667 FSB) 2 Physical CPUs.
I believe the GeForce is a 7600 or 7900 series. Not terribly new but not total garbage.
Curious if compiling the mame exe for the dual, dual core CPUs is possible and if it would help / what the overall performance would be like.