i would try running quake 3 with max bots in a window, rc5, seti, and running a filter on an image in photoshop that'll max out your ram so a lot of swapping occurs. playback of vid files is good too. this will stress all of the subsystems in your computer. rc5 is almost all integer, seti fpu, and you have graphics and i/o going like mad. and if it crashes, well, you just lose the info in your swapfile.