I have the antec shoe box case with no air flow and my Celeron D 352 3.2ghz is running at 80c when loaded. I run this computer for bit torrent and Folding so its running 24/7 at 100%. I replaced the stock cooler with zalman 7000 and did see about 5c drop, but due to no air flow I'm stuck at this temperature. Its been about 2 weeks since I built this and had no issue as far as smelling anything burning, but curious if this cpu/mb will last much longer if I keep running as is. Temperature reading seems pretty accurate since the heatsink is pretty damn hot to touch when the bios is indicating it to be at ~80c.