Lately I've been having issues. For thelongest time my screen would flash, clocks would break, eventually the screen was just black and no video. I switched the gtx260 to another pcie slot. Screen was fine, no flashes. However my 2 3d apps I use, Secondlife, Force unleashed 2 right now will both crash. I'm wondering if there is good software to test the GPU to make sure it has no errors or faults. There are no changed settings or clocks or anything. Fan has been up'd as the card is basically sitting on the floor now.