Hello All, I've learned a lot reading these forums over the last few years. This is my first actual post here - why not create another video card thread, right? I know... I'm sorry, I've searched a ton, and can't get a straight answer on this. I'm performing an OS upgrade/Mod to run Yosemite on a new drive in my Mac Pro 1,1. The guide I'm using suggests the Radeon 5770 as a reliable graphic card choice. I was about to pull the trigger on that card when I was told that the 5770 hangs on loading Adobe PS. Their guess as to why this happens is because PS assumes their working with a EFI64 machine, so they start EFI64 processes which hangs up the EFI32 Mac Pro 1,1. I'm hoping someone can give me the low down. I have heard that Nvidia cards work better with Adobe CS/CC. It has been suggested that I get a Quadro 5600 instead due to this issue. BTW, I'm hoping to run my LG ultrawide 34UM65 monitor at the 2560 x 1080 resolution it's looking for, and run boot screens. Thanks!