Temperature monitoring programs wrong?

Can you post a print screen of the temps on every monitoring software while idle, with lots of windows opened up, and when stress tested?
Thx.

Can you post a print screen of the temps on every monitoring software while idle, with lots of windows opened up, and when stress tested?
Thx.

Ramses De Vuyst,

You're probably trying to overclock on the stock cooler, which is not a good idea, nor is overclocking on auto Vcore. If you're going to overclock, then you need an aftermarket cooler.

Also, Intel Burn Test is brutal on a stock cooler. Use Prime95 version 26.6 - http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

Do NOT use a later version such as 28.5. Run only Small FFT’s for 10 minutes while using Real Temp to read your Core temperatures.

AI Suite is monitoring CPU temperature, NOT Core temperature. Real Temp is correct, which is designed specifically to monitor Intel Core temperatures.

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 your 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. Apparently your BIOS is wrong, which as previously mentioned, is a common problem.

Intel's Thermal Specification is "Tcase", which is CPU temperature, not Core Temperature. Tcase for the popular i5 4670K is 72C. Tcase + 5 makes the corresponding 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: 4670K (TDP 84W / 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

Those results with the new cooler?

I normally use HWmonitor however it differs on different motherboards (probably due to chipsets or sensor readings), Realtemp or lmsensors in Linux seems to be more accurate.

PS- 44C is a tad on the high side for idle but that completely depends on ambient temp and case cooling, if there's no vacuum (pull in from front and blow out back) then yes idle temp can get high. But with a stock cooler, that's normal.

Ramses De Vuyst,

We all remember science class where one of the guiding principles for conducting a controlled experiment, is that it's critical to follow the same procedure every time. This eliminates variables so results will be consistent and repeatable.

Since everyone tests their rigs using X stress software at Y Ambient temperatures with Z measuring utilities resulting in CPU or Package or Core temperatures, it's impossible to compare apples to apples. This is why processor temperatures are so confusing.

There are only three relevant values; Ambient, steady-state 100% workload, and dead idle. Applications and games are partial workloads with fluctuating temperatures, which are unsuitable for thermal testing or accurate temperature comparisons.

Prime95 Small FFT's is the standard for CPU thermal testing, because it's a steady-state 100% workload. This is the test that Real Temp uses to test sensors. Version 26.6 is well suited to all Core i and Core 2 variants.

Core i 2nd, 3rd and 4th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95 such as 28.5 run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces unrealistically high temperatures. The FPU test in the software utility AIDA64 shows the same results.

Prime95 v26.6 produces temperatures on 3rd and 4th Generation processors more consistent with 2nd Generation, which also have AVX instructions, but do not suffer from thermal extremes due to having a soldered Integrated Heat Spreader and a 35% larger Die.

Prime95's default test, Blend, is a cyclic workload for testing memory stability, and Large FFT's combines CPU and memory tests. As such, Blend and Large FFT's both have cyclic workloads which are unsuitable for CPU thermal testing.

Other stability tests such as Linpack and Intel Burn Test have cycles that peak at 110% workload, and are also unsuitable for CPU thermal testing. The software utility OCCT runs elements of Linpack and Prime95.

Shown above from left to right: Small FFT's, Blend, Linpack and Intel Burn Test.

Note the steady-state thermal signatures of Small FFT's, which allows accurate measurements of Core temperatures.

Shown above from left to right: Small FFT's, Intel Extreme Tuning Utility CPU Test, and AIDA64 CPU Test.

The "Charts" in SpeedFan span 13 minutes, and show how each test creates different thermal signatures. Intel Extreme Tuning Utility is also a cyclic workload. Although AIDA64's CPU test is steady-state, the workload is well below Thermal Design Power (TDP), which is insufficient.

Ramses De Vuyst,

All of this and more, including the answer to your question concerning idle temperature, is covered in this Tom’s Sticky: Intel Temperature Guide. Here's the link again - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Do yourself a favor and please give it a careful read!

Thanks,

CT