I5-2500k Weird Temperatures

[chickenboo]

Hey all, been lurking around a while and decided to see if anybody can give me some info on my problem. Just built a new rig two weeks ago and has been running flawless since.

Here are my specs:
i5-2500k
Asus P8Z68 Pro
EVGA 560 Ti
Patriot DDR3 1600 8GB 2 X 4GB sticks
Corsair GS700w PSU
Windows 7 64bit
Coolermaster 212 Plus with extra fan for push pull setup
500R case with awesome cable management so airflow is perfect.

I have overclocked it to 4.6 and with a few voltage tweaks, ran Prime95 overnight and no BSoD or other problems. Core temps ran right under 70c with Prime95 and idles at around 25c, but everyday to day usage it maxs around 45c while watching with Core Temp 1.0. Dropped it down to stock though, was just seeing what a safe overclock and voltage was for when I do need it.

On to my question. I have been leaving it running 24/7 just to make sure everything is in tip top shape and it has. Two times though I would come check the temperatures after three or four hours of idling and would see that Core #0 and Core #1 would have had a Min. Temp of 2c in one instance and another time I saw it at 18c. The other 2 cores kept the above mentioned idle of 25c. Anybody else seen this before?

 

[o1die]

Unless you live in the arctic circle, you won't see true temps under 20c. Your temps are fine. Coretemp isn't the most accurate way of measuring temps on some boards. I would try asus monitor program. It should be on the motherboard cd.

 

[geekapproved]

Try HW monitor

http://www.cpuid.com/softwares/hwmonitor.html