If you are using a winmodem (dialup, usually the cheap PCI modems @ the bargain bin), then a faster CPU (to an extent) will increase the performance and reliability of the modem. From my experiences years ago when I gamed on a winmodem and AOL (LOL!). I had a P2 400 and when I upgraded to a P3 933, not only did my FPS increase, but my ping lowered and I disconnected less often.