950 Mhz and 500 MB RAM should be way enough to have maximum frame rates. The gforce is fine as well, although GP3 does not really benefit from that since it uses acombined 3D/2D graphics engine and modern cards do not speed up 2D. Most important in the GP series is RAM and your processor, but I don't see any problems there.
However, you may need a cpu equivalent to Pentium 1,0 Gh + to enjoy full detail and high FR in the forthcomming GP4 - just a guess, tho.
REHAB IS FOR QUITTERS