These picture we taken from two seperate 2.8GHz Quad-Core Intel Xeon (8-core) Mac Pro Towers (with different monitors) at an agency I freelance as a Macintosh System Administrator. Both of the towers are less than three weeks old. They both have the same ATI Radeon HD 2600 XT video card in them. The agency purchased eight (8) of these new towers with this video card and we are sending three of them back because of the artifacts and freezing problems. We are upgrading all three of them to the NVIDIA GeForce 8800 GT because we cannot afford to loose any more man-hours on this problem. Please check back and I will let everyone know how the new cards work out. Also, you are welcome to link to this page if you need to show your Apple Technical Support person what the images look like.