Hi all, I have the rig in the sig at the moment and I'm starting to notice that the 8800GT is getting a bit slow for gaming. Specifically I play a LOT of L4D2 and this card can not max the game with the frame rates i need. It was fine for L4D 1. I play at 1920x1200 btw and need 60+ FPS at all times for competitive play. So, on to the questions! The way I see it my options are, along with their problems; Apple Approved Cards: 4870 512Mb (Marginal upgrade for too much cash) GTX 285 1Gb (Far too much cash) PC Cards: 4870 1Gb (Well supported it seems, but a marginal upgrade?) 4890 1Gb (Problems with power warnings and flickering screen on boot) GTX 285 1GB ? (not sure of flashing options, pretty expensive so it would need to be seamless) Is this synopsis correct? If it is that would leave me with either the PC 4870 or the PC 4890 Is it possible to get either of these working without ANY problems that will taint my Mac experience and stability? I am fine with flashing cards etc but I will not have my experienced compromised day to day just to get a cheaper card in the machine! What say you? is this possible with very careful card selection or should i just pony up for a supported card? EDIT: It looks like I can sell the 8800GT for about £130 on ebay so the cost of a 4890 would be negligible at this point, however, this would leave me with the flashed 4890 and only a 2600XT as backup. so would a well flashed 4890 be reliable enough for this set up?