There isn't much of a hit on the PC, but I did notice that on every PC I've put it on, the video gets a bit messed up around the system tray with little black boxes where the little program/status descriptions usually are when you move your mouse over them. But on topic, it is up to you whether or not you want to fold. A lot of it for me was to just contribute to the MacRumors team. When I am away in classes or sleeping I am not even using the computer, even though it is on all the time, so why not let it fold and give the team those extra points for the people who really want to keep competitive with the other teams out there. I like MacRumors and the general feel of everyone on here, so I'll do my little part and give the team those extra points.