Hi! I'm a new member with a dilemma. My 8800GT died on early 2008 (3,1) 8 core MacPro. I needed a new craphics card very fast and I was told that Mac edition 5770 works (in early 2008 machines, too) and was a good choice. I ordered one from Apple, installed it and it seems to work, but is veeery slow and doesn't recognize color profiles or display. I have 30" HP through dual-link DVI. Apparently a driver issue. After a bit of reading, I found out that 5770 requires also 10.6.4 for the drivers (should have been told that too..). I'm running Leopard 10.5.8 and not willing to upgrade because I have Adobe Master collection CS3 for my work. My system has been very satisfying and updating to Snow Leopard would mean also upgrading the whole master collection, for the stability, which is expensive and not very reasonable to do just because of the 5770. Is there any way to make Mac 5770 work in 10.5.8? I have read flashed 5770 cards running in 10.5.8, is that true? If so, how, and is it possible to do with Mac edition card? If it's impossible, any recommendations for some equivalent graphics card that is known to work (choices seem to be veeeeeeeeeeeery limited)? Should I just get another 8800 and forget the whole mess? Thanks a lot in advance!