I just got a PNY GF4 TI4600 and am running it on a Biostar M7MKE MoBo with Athlon slot-A 900mHz processor, 640MB of ram, and a 250 watt power supply. When I enable AGP 4X in the bios my system becomes unstable. It freezes any time I try to enter a 3D app or game or even when I try to run dxdiag. Even at AGP 2X the card kills my old ATI Rage Furry Maxx, but I was just wondering if anyone has any ideas. This Mobo is a few years old, but according to the specs it should be able to run at 4X. What can I try (besides an upgrade - I know it's time, but one thing at a time Thanks.