Hi, I recently had a problem with my motherboard and RMA'd it for a new one. So the new one came, and I didn't have new thermal paste so I had to put the CPU cooler back on with dried out paste. I had temperatures idle at 50-60c and Prime95 go over 99c. Playing a game like League of Legends went up to as much as 92c. So I cleaned out all the thermal paste and just left it clean. It idled at 40 but still went over 90c on Prime95. I decided I would get a new cooler and thermal paste. I decided on Artic Silver AA and the Coolermaster Hyper 212 Evo. After installing the new cooler and new paste, I'm getting temperature readings of as low as 14c. My thermostats for the house says the ambient is at least 20c. What is the problem? How is it possible that my CPU temp is 6c below ambient?
The programs I'm using are Core Temp and Speedfan.
I'm using an MSI P55M-GD41 Motherboard with an i7 860.
Its the full load temperature that you should be worried about, although I have read a few postings about i7 have broken sensors, you could RMA to Intel, but don't tell them about running without heat paste or they will void RMA.
With modern thermal regulation and speed step the computer can do 2 things to control temp. It can back down the FSB and Multiplier and the VRM can back down the v-core. I think its extremely unlikely that you did any damage, however when it comes to computers anything is possible.
More likely Core temp is wacked out and not reading correctly or the onchip temperature sensor is defective.
Check the temp in the mother board bios. It should idle around room temp while in the bios cause it is not doing any work. If it is lower than room temp the sensor or bios is wacked. You can try update the mobo bios. If the temp seems normal here then try hwmonitor in windows.
If the CPU sensor is defective best bet is to just live with it. Core temp should show you the temp of all 4 cores. Its unlikely that all 4 sensors are wacked so go by the highest one.
Your problem is a damages chip/motherboard. You can not expect reliable temp readings from damaged parts.
Inaccurate temps are the first signs of trouble.
You ask advice then you argue with people who work with these things on a daily basis?
You can’t be sure of anything in situations like this. Your comment is awfully arrogant. One thing I have learned in my 15 years of building and supporting PCs is anything is possible, and just when you are sure you know what the problem is something impossible happens to prove you wrong.
That said there is a pretty good chance that board and or chip messed up, but I would bet its fine.
cpu sensors have trouble detecting low temperatures, the lower the temperature, the less accurate they are. Go by the full load temp, disregard the idle temp if its that low. Something to try would be to update your motherboard BIOS with the latest from your manufacturers website. This can often fix temp monitoring issues. Even just hard resetting the bios to factory defaults can fix odd issues like this. I've seen cpu's report 128C and flashed to new bios and it was fine. Have had fans running at max speed, no matter what settings, hard reset the BIOS, fixed. So try that, it might/might not work, but its worth a try.