I got my MacPro back Wednesday they replaced the graphics card but the issue still persist. The people at the apple store clam that it is within spec. In an attempt to see if I could get the issue to go away I zeroed out the hard drive. Then reinstalled the OS. I even made sure not to have anything to do with the suspect screensaver. Never the less the Redraw is still appearing. So it your counting cards that appear not to work count both of my cards.