my system is an AMD XP2500 with 2x512 pc2700 DDR. But in this case, only the CPU matters. With mame set to high priority it plays KI 1 perfectly, no dropped frames. KI 2 run while dropping about 3 to 8 frames. So my setup is right at the CPU power borderline. Just thought you might like to know what it takes to run them in case you upgrade.......