Hi there, i'm planing to upgrade the graphics card on my Macpro 1,1, but i don't really know much about graphics card. I decided to go with AMD R9 280 3GB or AMD HD 7950. but there are different options like UEFI, OC, different editions with different cooling fans. and also the prices change a lot from one model to another; some Ebay second-hand ones are even more expensive than new ones on Newegg. I initially wanted an AMD Firepro but didn't find any information regarding the capability for macpro 1,1. I use CAD software lightly, more than i game. Can someone tell me the must for this graphics card upgrade? Or direct me somewhere? And is there any AMD Firepro that works with Macpro 1,1? I've been READING on it guys, but i'm still confused.