| well from what i understand, parallels is program which allows you to use another OS while booted into OSX. Normally, such a program requires a decent amount of ram, and a fairly effective processor.
Bootcamp, on the other hand is essentially a dual boot system, allowing you to choose whether to boot into either OS (Windows or OSX is normally the options).
Bottom Line, if you want to be in OSX and Windows at the same time, use Parallels. If your only going to be in one at a time, use bootcamp. |