I got my rig in September last year, and haven't cleaned it out since. However, today I went in to it and shot some air around, marvelling at the massive clumps of dust that flew out of my CPU and GPU fans (along with every case fan in my computer). The amount of dust in there was almost unbelievable, i was practically choking on it the whole time.
my question is: will this noticeably affect performance in games? I thought my rig wasn't running as well as possible for having 4gb of ram, a 640MB 8800GTS, and a 2.4GHz quad core processor, but I haven't had the chance to try out a couple graphics-intensive games since blowing it out. I still have visions of that 2-inch in diameter clump of dust flying out of my GPU fan, and something tells me it might run a little better after that.