i highly recommed a fan on it, but if you are using a psu that pushes mad air, some ductwork could replace a fan, bu tlike i said, i dont recommend it. once, my fan did not turn on (turns out that the company that made the fan for amd had a big recall) when the comp did, and i didnt notice. i started up, checked chpzilla, thg, xbit, anandtech, the standard sites, then watched a movie. about 20 mins in, it was dropping frames and then crashed altogehter. i took out my thermocouple and measured the heatsink... 105c.. it took me a minute or so to find a termocouple... so taht makes the temp a litle higher. after fixing the fan and restarting, i looked in bios. the cpu shutdown tempearature is 130c, ant it must have read that temperature to shut down. ( i later set it to a lower temperature jsut to see if it worke, and i got ti to shut down every tiem i turned it on, had to clear the bios, so i KNOW that the thermal monitoring system on my dfi infinity works great) its amazing that the cpu lived at well over boiling water temepratures (i nearly burned my had measureing temp wth thermocouple). thats my experience with no fan on a heatsink with a recent cpu ( was a 45w mobile 2600+ undervolted, cause the heatsink was $hit) basically USE A FAN, YOU WONT REGRET IT
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