1 2 3 4 Previous Next 48 Replies Latest reply on Aug 6, 2015 1:11 PM by rguevara

    i7 4790K temperatures




      I have a question about the temperatures that I'm getting for my 4790K processor. Like some other people I'm getting extremely hot temperatures when testing the processor at full load.


      I am using a Gigabyte GA-Z97X-UD3H motherboard in combination with a Thermalright True Spirit 140 cooler in order to get lower temperatures than the stock Intel cooler.

      The temperatures are measured with HWMonitor, RealTemp and the Gigabyte System Information Viewer app. The last one shows slightly lower temperatures then HWMonitor and RealTemp.

      The room temperature is around 19°C.


      Idle I'm getting temperatures between 20°C and 26°C (depending which core). The Gigabyte app shows even a temperature of 18°C. So far so good.


      In what follows I'll continue with the Gigabyte app temperatures, as the graphs are made with the Gigabyte app. Remind however that HWMonitor and RealTemp are showing higher temperatures (around 6°C higher).


      As soon as I use Prime95 with the small FFTs test (latest version) to put the cpu under load, the cpu temperature increases instantly to temperatures around 92°C (HWMonitor is even showing 100°C from time to time).


      In the graph below you can notice 2 temperature peaks. The first one (lower one) is achieved by running the Prime95 Blend test (max temperature after 3 minutes around 57°C), the second one is achieved by running the Prime95 small FFTs test as described above, with temperatures above 90°C.

      The test is done immediately after a cold boot.




      The cpu-cooler is at startup running at 550rpm, during load it increases to 1250 rpm.




      Another thing I've noticed is that the temperature increases instantly from 18°C to 90+°C, within 2 seconds. As soon as I stop the test the temperature decreases instantly as well: within 1 second the temperature is decreased till 30°C. Next it takes 2 minutes to further decrease to 19°C (idle). This behavior looks very strange to me.


      What is going wrong? Why do I get such a high temperatures during load? 90+°C without overclocking is dangerously high. I don't dare to overclock with such a temperatures.


      Many thanks for your help!



      I've done the test with the default BIOS (F4) and the newest BIOS (F7) from Gigabyte.


      Edit 2:

      In the meantime I was able to do a stress test with the Intel Processor Diagnostic Tool and the Intel Extreme Tuning Tool (10 minutes). Temperatures increased until 71°C, core voltage increased until 1,269V (measured with RealTemp and HWMonitor). These temperatures are better than with Prime95, but still very high.


      Edit 3:

      After running Intel Extreme Tuning Tool for 1 hour, the max temperature was 73°C. In average the temperature was below 70°C. The idle temperature is around 25°C regarding the Intel tool. Room temperature should be around 19°C.

        • 1. Re: i7 4790K temperatures

          Thanks for joining the processor community.


          I am currently researching on this issue. As soon as I can, I will send you a message with my findings.


          Thank you for your patience and understanding.



          • 2. Re: i7 4790K temperatures

            Thank you for your reply!


            In the meantime I did some additional testing after playing around in my BIOS. I will put my findings here, maybe they can help you.


            I have put the VCORE setting in the BIOS to 'normal' and next I could change the VCORE OFFSET setting. I have changed it into a negative offset value of -0,080V. By doing this I could reduce the voltage during load (and also idle of course) and hence reduce the temperatures with around 10°C. That means that the VID voltage, measured by HWMonitor during the Intel Extreme Tuning Tool stress test, was reduced from 1,269V to 1,189V, and the temperatures went from max 73°C to max 63°C. Also the temperatures during the Prime95 small FFTs test went down a bit, from around 100°C to beginning 90's°C. The voltage during this test was 1,244V instead of 1,3+V.

            The idle temperatures remained more or less the same, but the idle voltage decreased as well till 0,647V.


            I'm actually not sure if my pc is running stable enough right now with these changes: therefor I should do a long (stress) test. I'm also not sure if this 'undervolting' is good for my system. And I don't think that this is default behavior that one must do in order to keep his/her cpu cold enough.
            Besides this is 90+°C during prime95 still a very high temperature I think.


            Many thanks for your help!



            There are 2 more things I've noticed during testing and monitoring the voltages and temperatures:

            • I have never seen the CPU running @ 4,0 Ghz. During load it's constantly running @ 4,4 Ghz and idle the clock speed is going down till 0,9 Ghz. It's varying between these 2 upper limits but honestly I didn't see the default clock speed of 4,0 Ghz yet.
            • I have never seen the CPU throttling, even not when the temperatures almost reached 100°C during Prime95. Maybe when they exceed 100°C, but I don't dare to test this to avoid cpu damage.
            • 3. Re: i7 4790K temperatures

              Thanks for the update. I am sure this information is helpful in order to isolate this matter.

              Our engineering team is requesting some screenshots of the programs you are using to monitor processor temperature. Would you send some pictures of them? This would be really important.


              Thank you



              • 4. Re: i7 4790K temperatures

                Dear Allan,


                Many thanks for your time!


                I have created 3 screenshots with some of the programs that I'm using to monitor temperatures, voltages, cpu fraquency, ...

                I have reloaded the optimized defaults from my BIOS, so all voltage regulation is handled by my motherboard and the cpu.


                The first screenshot is taken when the cpu is idle (ca. 5 - 10 minutes after a cold boot). Watch the low temperatures (room temperature is ca. 18-19°C). I don't know if the measured temperatures are even possible (maybe the sensor is not working correctly?).


                The second screenshot is taken when running the Intel Extreme Tuning Tool stress test for ca 4 minutes.


                The last one is taken when running Prime95's small FFTs test. Watch the extreme temperatures (when the voltage regulation is done by the motherboard, you can see the cpu throttling in the screenshot) and the voltage which is used (1,3+V). This is after only 20 sec of running the test.


                I hope these screenshots will help you. Please let me know if you need more details.

                • 5. Re: i7 4790K temperatures

                  Great, thanks for the pictures. I will forward them to our engineering team.


                  Thanks for your patience.


                  • 6. Re: i7 4790K temperatures



                    I have removed my processor cooler this evening 2 times, cleaned the cpu and cooler with denatured alcohol and re-installed the cpu-cooler again. I have used different amounts of cooling paste, but I can't get the temperatures down. In contrary: the first time I had temperatures which were 4°C higher, the second time the temperatures were more or less as before (1 or 2 degrees higher maybe). So a badly installed cooler doesn't sound very likely.


                    I've also used the tool IntelBurnTest to test the temperatures, and with the stress level set to "standard" I'm getting temperatures mid 90's degrees Celsius. When I put the stress level to maximum I'm getting temperatures around 100°C and the cpu starts to throttle.

                    • 7. Re: i7 4790K temperatures

                      Thanks for the update.



                      • 8. Re: i7 4790K temperatures

                        Hello all!


                        I'm having the same problem with an i7 4790k processor and a asus z97 maximus hero VII motherboard. I'm using a Corsair H80i closed loop cooler. The processor runs at stock speeds with AUTO mode in BIOS. I was wondering if a solution was found yet.


                        Thank you!

                        • 9. Re: i7 4790K temperatures

                          Hi Woolphy,


                          I am still waiting for a reply from Intel.


                          What's the status of the investigation?

                          • 10. Re: i7 4790K temperatures

                            This problem has been escalated to our engineering department; any information on this topic would be updated at the thread below:





                            • 11. Re: i7 4790K temperatures

                              Good morning Allan,


                              I was following the thread you've suggested to me the last weeks. But since there is still no solution or reaction from the engineering team, I was wondering if you could give me a status update. I am still using my pc as some kind of test system right now, but it actually should be my production system. I however don't dare to start cpu-intensive workloads due to the temperature issues. What do you suggest me to do? I could request an RMA but if there is a structural problem with these cpu's (what multiple sources seem to suggest) this will not be a solution.


                              Many thanks for your help and support!


                              Kind regards

                              • 12. Re: i7 4790K temperatures

                                I still do not have an update for this topic.


                                Any information on this matter would be updated at the thread below:





                                • 13. Re: i7 4790K temperatures

                                  I also have this issue. Processor works fine but I can't keep the load temperatures remotely under control even with an aftermarket cooler and arctic silver. As you say it jumps from room temp to near tjmax within about a second after starting prime.


                                  When running with a few less threads to avoid thermal cutoff, still huge temps on the cores but honestly the heat sink isn't particularly hot, I can touch it, just mildly warm at best, so could it be the temps being incorrectly read / not actually conducting well onto the top plate of the processor? I mean a jump from like mid 20's to 90 in a second is pretty insane even for these sorts of processors.


                                  I've checked the thermal paste its great, redone it a few times assuming it must have been poorly spread, used the same cooler on a 4770 which I upgraded from, no issues at all with temps. CM evo212.

                                  • 14. Re: i7 4790K temperatures

                                    Just adding my name to the list of people with this issue. My cooler however is a Swiftech H240-X AIO water-cooler, which to be honest shouldn't have any issue cooling this processor. Without load, the processor stays at ambient as you'd expect. The In-Place Large FFTs and Blend in Prime95 run about 40 degrees above ambient (70 degrees). Using the Small FFTs results in instant >100 temperatures and the computer will eventually restart. I had read recently that someone removed the heatspreader from their 4790K and found cooling afterwards substantially better, which supports the idea that there's terrible heat conductivity between the top of the die and heat-spreader. If it matters, my batch is L424B559, but from the looks of it, a lot of people are reporting thermal issues with this processor.


                                    Edit: Re-seating my cooler helped a little bit (my bad on that one, but I had changed from stock for the same reason anyway), can run the Blend after the initial extra heating, but after a couple of minutes where it packs on more heat my computer will restart.


                                    Using XTU my CPU temperature stays around 58-60 degrees which of course is fine. I assume this would be simulating normal 100% cpu conditions?


                                    Edit 2: Weird, my CPU isn't thermal throttling, even with it specifically enabled in my BIOS (Gigabyte Z97X-UD5H Version: 1.0/F8), so instead it's just restarting.


                                    Edit 3: Reading more, it sounds like it's Prime95 putting unrealistic load on the processor (AVX in the FPU??).

                                    1 2 3 4 Previous Next