I have a mac pro with nvidia geforce 7300GT. In bootcamp, the playback of blu ray and hd-dvd has hiccups. It displays, but with the occasional line flashing in it. I want to upgrade the graphics card. What would be the best one? I have PCIe, not 2.0, so I think the 8800 is out. Looks like the 8600 would work, but I'm not 100% sure that all the nvidia cards are mac pro compatible. The apple site offers no help considering my current card is still listed. I'd appreciate any suggestions.