6 Replies Latest reply on May 17, 2017 8:12 AM by TGrable

    Wrong data from thermal sensor i7-7700K?

    AlexeyL

      Hello.

      I found that my i7-7700K under 100% load shows 90-100 C degrees, but in reality CPU cooler is warm, not hot at all.

      Yes, of course I tried re-mount CPU cooler, reassemble it's mounting part on motherboard, reapply thermal paste - nothing changed, cooler was little warm, not hot.

      I came to shop, where I bought PC and we made following tests:

      • My motherboard (Gigabyte H270 Gaming 3) + my Intel i7-7700K + my CPU cooler Thermalright True Spirit 140 Direct
      • My motherboard (Gigabyte H270 Gaming 3) + my Intel i7-7700K + another CPU cooler Thermalright True Spirit 140 Direct
      • My motherboard (Gigabyte H270 Gaming 3) + another CPU i7-7700K + another CPU cooler Thermalright True Spirit 140 Direct
      • My motherboard (Gigabyte H270 Gaming 3) + another CPU i7-7700K + CPU cooler Thermalright Arrow Silver
      • Another motherboard, also Gigabyte H270 Gaming 3 + another CPU i7-7700K + CPU cooler Thermalright Arrow Silver
      • Gigabyte Z270X Ultra Gaming + another CPU i7-7700K + CPU cooler Thermalright Arrow Silver
      • Motherboard Asus Z270F ROG Strix + another CPU i7-7700K + another CPU cooler Thermalright True Spirit 140 Direct

      In total we tested 4 motherboards, 3 CPUs i7-7700K, 3 coolers. In all cases we run Prime 95 Small FFT test to heat up CPU to 90-100 degrees (yes, throttling was enabled at 100 C). We left test running for 5 minutes in each case. Then tested real temperature by finger.

      In all cases cooler temperature was little bit warm, not hot at all. It makes me think that probably CPU reports wrong thermal data.

       

      One more weird thing about i7-7700K is that temperature from idle 40 jumps to 90-100 degrees in just 2 seconds. The same, when I close Prime95, temperature decreases from 90-100 to 40 degrees in 2-3 seconds. I'm not sure - may be this is normal behavior, but looks too fast.

       

      Temperatures were measured using the latest version of HW monitor. "Intel Processor Diagnostic Tool" for all CPUs reported that they are OK.

       

      Intel, could you please comment on this? Is there any issue with thermal sensors of i7-7700K?