I recently built a new HTPC using the A10-6800k APU. I'm having a few issues with it, but my biggest concern is the temperature readings I'm getting. From a cold boot straight into the BIOS, the readings show the temp climb steadily to approx 65.5 C. This is with the computer doing nothing but boot to the bios. This is also with the case open and case/CPU fans blowing on it. AMD Overdrive gives me readings that range from 0 to 55 C, again with the computer idle. It usually fluctuates for no discernable reason, although as of this writing it says all 4 cores are 0.0C. (EDIT: by the time I finished this post, it climbed back up to 20C)
AXTU ususally shows the temp to hover around 38C at idle, although a few times while trying to solve this mystery, it did seem to match AMD Overdrive pretty closely (on these occasions, it was reading 50C while doing nothing). Speedfan seems to always match AXTU.
So which of these is accurate? One thing I've noticed, is that from a cold boot into BIOS, as the temp steadily climbs to 65+, if I touch the heatsink (very scientific, I Know) I can feel it warming up significantly. If I exit the BIOS and let the PC boot to Windows (Win7 64-bit) I can feel the heatsink cooling off. So why does just sitting in the BIOS burn up the CPU?
For the record, I have taken off the CPU fan and heatsink, cleaned both surfaces, and re-applied thermal paste and firmly reattached the fan. I've built several PCs before, so I am confident it's not a matter of a poorly attached heatsink or fan. It is the stock heatsink/fan that came with the APU, and I've read where people say it's garbage and to replace it etc... I'm not overclocking at all (in fact my speed often cuts in half for no reason, but that's a separate issue). With no overclocking, the heatsink/fan AMD deems fit to ship with their product should be able to do the task it was buit for - keep this APU at a healthy temperature.
So should I be concerned about these temp readings? Is the BIOS temp reading accurate, and why is it burning up my CPU just sitting in the BIOS? Like I said, I'm having a few other issues with this build too, but one thing at a time. I can't really even put the case on and put it on the shelf since I'm afraid to burn it out. Any help/info would be appreciated.
AsRock FM2A75 Pro-M4 Motherboard (lastest BIOS 2.60 avail from their website)
Coolermaster 600W RS600 Powersupply
4Gx2 GSkill DDR3 2133
Samsung 120G SSD and Toshiba 2TB HDD
Win7 64bit edition
Nothing overclocked, BIOS at pretty much default settings (if any specific setting is needed to help, let me know and Ill answer ASAP)