I recently posted in the mac pro forum about my disappointment with purchase of a Radeon 7950 mac edition video card for my Mac Pro 3,1. There are definitely improvements there compared to the 8800GT that was previously in the Pro but certainly not the night and day boost I was expecting. I will focus on Dirt 2 as the point of comparison. Under OS X I had to use a mix of medium/Low/Off @1680x1050 to get a playable framerate and even then on some tracks the framerate would plummet to a level that was barely acceptable. Other game's performance such as the Witcher 2 and WoW, were also underwhelming. So I was kinda fed up and decided I would install Windows 7 on my Pro and see if that faired any better. I was expecting maybe slightly better performance under Windows 7 but the performance delta is huge. Dirt 2 under windows 7 with everything turned up as high as it can go and with post processing effects higher than that allowed in OSX in addition to 8x AA was absolutely flawless. It never ever dropped below 60FPS and without vsync my framerates were averaging around 100+ Other games showed similar improvements. So where do these problems lie in OSX? Apple's OpenGL framework? The Graphics vendor's drivers? or are the game ports to OSX simply unoptimised? It's really disappointing to me as I would prefer not to have to run windows at all but sadly for decent gaming performance it seems to be a necessity. Thoughts?