Yes, yet another thread like the others. And yes, i've done my homework and searched this forum and i actually read most of the posts that cover this thing. The thing is, everything inside my mac pro kciks ass expect my gpu... its the x1900 which is really, really bad, at least for gaming; bad fps, high temps, bad usage of memory or memory leaks for no reason, MANY new games have bugs that are related ONLY to this card (like gta iv) and also it gets all dusted so easilly. So anyway, i was looking at the HD4890. I understand that there's not even a mac edition of it (that wouldn't really work on a 1st gen mac pro anyway right?), but i was thinking if i could use a flashed one. The thing is, i've heard a lot of people talking about another card, the HD4870, which i think has a similar rom with the HD4890, but of course i could be wrong. So about the 4870, i heard people saying they got it to work, for bothed a flashed pc version and the mac edition... could anyone confirm this? If those cards do work, i cant think of why the 4890 couldn't. Please enlighten me macheads 