For those who don't know, this is a Socket A CPU fan and Heatsink. This fan seriously r0x0rs. It's a skivved all copper base, dimensions of the base are roughly 80x80mm, mostly it's made for high performance PCs and overclockers, I bought it for the latter reason. Without overclocking, attached to my AMD Athlon 2500+ XP Barton Core chip, it's keeping it cooler than my ambient case temperature; and that's saying something as I have a 5 fan setup not including the PS, 3 intake, 2 exhaust.
It's impossible for a CPU to be cooler than the ambient air temperature unless you are doing some sort of active cooling like a peltier or water cooling. Most sensors also have a margin of error. Do you have to wear hearing protection when you start your PC? Mine only has 3 case fans and a ThermalTake DragonOrb and it's pretty loud..
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