The downside is that Supreme Commander can bring the most modern PCs to their knees. Since the game is keeping track and simulating hundreds of units over such a large area, it doesn't take much before the frame rate will start to stutter. On our test machine with a dual core CPU and 2GB of RAM, we experienced slight pauses on the humongous 81k-by-81k map. On smaller maps with a larger set of AI opponents, the action slowed to a virtual crawl as the system strained to keep up with the action. It's doubtful that a PC has been built yet that can run Supreme Commander's largest map with a full set of AI opponents at high graphics detail. Thankfully, you can adjust the graphical settings quickly and without having to restart the game, so if the battle starts to chug, you can simply go to the options menu and lower the visual detail to smooth out the frame rate.