I don't know much about video cards and haven't even had time to look inside to see what the difference is between these two. I have a 2012 3.2 ghz Mac Pro Quad Core with an ATI Radeon HD 5770 1024 MB Video Card. I also have a 2008 2.8 Mac Pro Quad Core with a NVIDIA GeForce 8800 GT 512 MB. I'd like to swap the video cards. Is this possible? As always, Thank you for your valuable input.