Hey guys, My boss just gave me a Mac Pro A1186 -- as he just upgraded to iMacs in our office. Its got 6GBs of RAM and I'll be replacing the HDD (possibly with an SSD) and the GPU. I've read a fair amount of the numerous threads here regarding the GPU upgrades but I can't find a 5770 in store -- except for Apple. Any suggestions so I can finish this weekend project? (If I can find a different model in store will I have to do a bios update?) Thanks a ton!