Upgrading from a Intel 82945g video card
 

The machine is a Gateway GT5404 w/ Pentium D Processor 915 dual core each @ 2.8 GHz---2 GB RAM---and the problem is an Intel GMA 950 (82945G Express Chipset Family). Works fine for surfing but not gaming. I have a PCI Express slot available. I have installed PCI cards in older systems, but not...