I'm running a Mac Pro 1,1 with a flashed ATI HD4870 - everything has been fine since getting the card back in March - played HL2 and Torchlight with nice framerates and no problems. I bought Starcraft 2 today, partly to give the new card a proper workout. Everything looked great to start with smooth graphics, nice lighting effects etc. then I started to get flashing lines and angular artifacts appearing all over the screen. Now, thing is, this is what happened to my old X1900 XT when playing WoW. At first just slight graphic glitches and flashes but, over time, getting worse more quickly until the game became unplayable within minutes of starting it up. Getting the HD4870 fixed this and I was able to play WoW no problems after that. I'm just wondering if this means my card is (already) on its way out - deteriorating like the X1900 did - or if it's something else in the computer that might be showing signs of stress? I haven't seen anything here about the HD4870 failing on Starcraft. Any ideas would be helpful. Thanks.