Well i decided to turn off my pc for one night after 1 week running it straight on 65% fan speed (around 62 C stable). Then I wake up, and turn on my pc and I hear this like rickety noise... im like WTF! I then find out its my GFX so i pull it out and clean off some dust (yeah my pc got a lot of dust this month...) I put it back, still making that LOUD ASS noise.. im like shit.. now i need to change my GFX... but then i touch the fan slightly (pushing it) and it stopped making that noise.... so im wondering should i go and do this with my new 5870 or is mining not profitable? and how long do your cards last on maximum usage, 60-70% fan, and around 55 C to 62 C.