Haha! a 1GB 9500GT PCI card! The reason why the 9500 outperforms the 9500 is from the memory AFAIK
, since the processing power is bottlenecked already. It actually started since the X1600 era...so the 9500GT is probably the last highest model you can get.
Only reason I would get a PCI GPU is when you have no AGP/PCI-E slot and want to disable your onboard card. I have a Powercolor 4350 PCI card (Silent), and it still sits in the drawer...the frakin' thing takes two slots! The heatsink is huge...would of prefered active, but meh...it helps when you got no choice other than a PCI card.
Oh and...gaming? Pff yeah, good luck running Crysis on decent settings (Or more recent games).