has anyone tried one of these GTX 260 OC cards in their '08 MacPro Octo? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130426896463&ssPageName=STRK:MEWAX:IT I'd like to move up from the stock ATI card, for rendering Magic Bullet/Colorista/RedGiant products in FCP6, and possibly CUDA for CS5, but still on CS4 so far. Would it make any difference for AE CS4? The GTX 285 is another obvious choice, but at twice the price, I doubt if it will provide twice the performance. Let me know your experience or comments.