Hi, I have a 2010 5,1 quad core soon to be upgraded to hex core mac pro with 16 GB of RAM. I want to upgrade my video card. I mainly use my machine for audio work, Logic Pro X, and many other audio program. I am hoping an upgraded graphics card will speed up things moving across the screen. For example, large scores scroll slowly. The two cards I am considering are the Sapphire Radeon HD 7950 Mac Edition and I am assuming flashed Radeon HD 7970. MacVidCards has one on ebay. I only want to choose between these two. I like my boot screen. They are both about the same price, so that is not really an issue. Which one and what will be the benefit of one over the other? thanks in advance.