Agreed. That would be too high for my comfort.<br><br>
I had a thermal issue with a E6400. I was able to drop 10c by getting a tower cooler and lapping the IHS and HSF. Lapping the HSF alone would help the temps and save your warranty on the E6600. The footprint on the CNPS9500 does not fully cover the C2D IHS, that might be an issue also.<br><br>
IMHO 55C is the limit for general loads (gaming) and 60C for Prime95 on both cores over 24hrs.
Try "Auto". If the system won't remain stable (Prime95 x2) then set it manually. I wouldn't go above 1.45V for longevities sake, though other more experienced users have stated that they run at 1.6V <img alt="" class="inlineimg" src="/images/smilies/eek.gif" style="border:0px solid;" title="EEK!"> - I'm too chicken for that, besides we are on air, not water.
I've actually undervolted my E6600 to 1.28125V and I'm perfectly stable at 3.2Ghz.. running 58C full load with TAT, so you could try to use stock voltages (1.325V I thought), see if it will run. Temps should be a bit lower as well
According to what I've read, the TAT reading isn't important for the maximum operating temperature. The max operating temp (60.1°C I believe) is measured (by Intel) on the face of the IHS, not at the actual core/s. From my understanding of this, it is pretty important to keep the CPU at or below 60°C when both cores are fully loaded.<br />
Current thinking is that 1.45v is a "safe" max voltage for the E6600 under air cooling, but that could change over time as we learn more about the chip's long term over-volting tolerance.<br />
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