Ive got a P4, 2gigs of ram, 1550 Radeon pci (not pcie), Windows xp. Im trying to run a large city but for some reason, after a short time, the days stop. I can scroll and the sound still works. The cpu is at 100% and i cant figure out why. I know the P4 is old, but it should be alble to run SC4 right? I am runing the game in software mode, and all the settings are on low. I can play any of the cities that are medium or small, but the large one just stops. It will be runing fine, then they just stop. Its almost like the game is file swaping. Do the large cities really eat up that much of the cpu?