I flashed this card according to pimpmolo instructions. The card boots and functions properly in both osx 10.6.4 and windows. However, I do have issues when playing graphically intense games. It doesn't appear to be a heat issue because a game might run for several hours or 30 seconds. When the card hangs the screen displays the image on the screen when the lock happened with an overlayed checkerboard pattern. At that point I have to power off the machine. Can someone look at my modified rom that I flashed to double check?