cpu temperature confusion

[Bigwood daddy]

Hi guys i have got asus H81m-v3 motherboard and i installed aIsuite III latest version and HW monitor , however the temperature reading for the cpu on Asus Al suite is less 5 degree Celsius than that on HW monitor. For example if the cpu temperature is 35 on asus alsuite then its is 40 on hw monitor. Which one should i take for granted? Is there is something wrong in my motherboard?

 

[Geek Jed]

Mine does that also, no worries, use HWMonitor.

 

[MarkW]

5 degrees is nothing to worry about. There are several sensors around the CPU. The two programs are probably using different ones.

 

[CompuTronix]

Bigwood daddy,

AI Suite is monitoring CPU temperature, NOT Core temperature. Hardware Monitor is often inaccurate. Real Temp is accurate, which was designed specifically to monitor Intel Core temperatures. Here's the link: http://www.techpowerup.com/downloads/2089/real-temp-3-70/

Don't get stuck on CPU temperature. CPU temperature and Core temperatures are completely different measurements.

CPU temperature is calibrated to look-up tables coded into BIOS for each socket-compatible processor. The monitoring utilities provided by motherboard manufacturers on the Driver DVD reads CPU temperature. Thermal code can vary greatly between BIOS suppliers and version updates, and can be wrong by more than 30C. BIOS or CPU temperature may not be accurate.

Core temperature sensors are factory calibrated by Intel, which function independently from BIOS. Core temperature is the standard for thermal measurement because it's consistently more accurate than CPU temperature.

Intel desktop processors have thermal sensors for each Core, plus a sensor for the entire processor, so a Quad Core has five sensors. Heat originates within the Cores where Digital sensors measure Core temperatures. A single Analog sensor under the Cores measures overall CPU temperature.

By design, Core temperature is 5C higher than CPU temperature due to sensor location, IF BIOS is coded correctly for the CPU temperature sensor. Your BIOS and the corresponding CPU temperature in AI Suite and Hardwarte Monitor may both be wrong, which is a common problem.

Intel's Thermal Specification is "Tcase", which is CPU temperature, not Core Temperature. Tcase for your G3258 is 72C. Tcase + 5 makes the equivalent Core temperature 77C.

The relationship between Core temperature and CPU temperature is not in the Thermal Specifications; it's only found in a few engineering documents.

Here's the spec's for your processor:

4th Generation 22 Nanometer: Pentium G3258 (TDP 53W / Idle 2W)

Standard Ambient = 22C
Tcase (CPU temp) = 72C
CPU / Core offset + 5C
Tjunction (Core temp) = 77C
Tj Max (Throttle temp) = 100C

At 22C Standard Ambient, here's the typical operating range for Core temperature:

80C Hot (100% Load)
75C Warm
70C Warm (Heavy Load)
60C Norm
50C Norm (Medium Load)
40C Norm
30C Cool (Idle)

Please read this Tom’s Sticky: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Everything about your processor temperatures is explained in detail.

Thanks,

CT