Hey guys, So I'm attempting to OC this card to no avail. Naturally it handles the 900/1300 that CCC permits but I have yet to find a program that will take it further. Some will allow clock adjustments (CCC, AMD GPU Clock Tool, Afterburner) but only up to the 900/1300 cap ATI set. And others (Rivatuner, GPUTool) allow no adjustment at all. What puzzles me is that W1zzard successfully OCd other 5870 revision cards past the limit and did so using GPUTool. Also to note, AMD GPU Clock Tool causes a black screen if I set clocks past the limits. Any ideas?