I realize even if the lower reading from the BIOS is correct these temperatures are unacceptably high, but is it possible all 3 readings are incorrect? I get the same readings immediately after booting from a 30 minute power-off, and the core temperature doesn't decrease even when I am just running windows and normal background processes (I tried this for about half an hour).
Possibly relevant system history:
System was assembled 2.33 years ago. I haven't used this computer in over 2 months. 4 months ago I removed the processor from the mobo and packed it in a static-shielding bag for air travel (box+mobo were checked, processor and other components carry-on). When I reassembled at my destination (still 4 months ago) the thermal coating had dried onto both the heat sink (Intel E41759-002) and top of the processor. The system seemed to function normally (although I didn't take any temp readings) for 2 months up until I flew back home, this time keeping the cpu on the mobo but still removing the heatsink (Intel E41759-002)). I reassembled the box yesterday and everything was functioning normally, I only noticed the core temp because I was using Speccy to discover unrelated system information.
I have some thermal paste arriving in 3 days. I would still like to know what could be causing the different temperature reading between the software and BIOS, as well as what else I may be doing wrong to overheat the cores (I doubt new thermal paste will reduce the heat by 50C by itself).
Is it safe to run my system before I replace the thermal compound? Is it safe to run the system after removing the old thermal compound using metal-metal contact b/w heatsink and processor while I wait for the new compound to arrive?
This is my i5-750 experience. Bios at iddle shows 53 C, with default heatsink and fan controll off /means always on full spin/ Windows 7 reports 64 C through intel core series widget when idle, at full load reports 100-110 C, bios warnings are enabled at 70 C, i have to push my system hard to get bios cpu temperature warning /so 110C in w7 is 70C in bios/. Maybe one of motherboard updates caused this. Motherboard: Gigabyte P55-UD4... my system ran for 3 years almost 24/7 with GPU and CPU computing enabled. This must be software or driver related issue. It seems that i5-750 have pretty good endurance when pushing to the limits.
Update: i realized that temperature measurement in intel core series gadget in w7 is dependant on proper TjMax setting, so in user manual to i5-750 there was TjMax 72,7 C, i have had TjMax 127 C so the measurements were all wrong. I have had to enter the proper TjMax values into the gadget.