1 2 3 Previous Next 682 Replies Latest reply on Apr 6, 2016 9:04 PM by overheating

    How best proceed with overheating i7-4790K?


      I have an i7-4790K in a GA-Z97MX Gaming 5 mobo latest F4 BIOS.


      I used a Noctua NH-L12 cooler rated at 95W for cooling the processor rated at 88W in a Lian Li PC V354 with 4 fans, 2 in 2 out, case closed and case open, ambient is 27-30°C.




      Temperatures in BIOS and memtest86+ were high so I decided to try stress testing and in Prime95 small FFT cores 1&2 overheated to 100°C using Core Temp.


      I tried reseating the heatsink and renewing the NT-H1 TIM and opening the case but it made no difference. I have a photo of the contact pattern here.



      When I tested using the OCCT benchmark I was unable to complete a test due to the processor overheating so I underclocked the processor to 3.6 GHz, disabled turbo and manually set vCore to 1.1v.


      With an underclocked processor I was able to get a heating and cooling curve using the OCCT auto capture, to enable me to study the problem.

      2014-08-04-13h45-Temperature-Core #0.png

      Even when underclocked the processor was reaching high temperatures, rapid fluctuations in temperature with work load suggest a bottleneck in the thermal pathway. When I tested with the intel retail cooler which came with the CPU the cooling was much less effective than the NH-L12 (even when underclocked taking just over a minute of OCCT to reach the 85°C cut off point see below) indicating the NH-L12 was doing a good job of removing heat, which meant the processor was making the heat or the source of the bottleneck.

      2014-08-04-20h25-Temperature-Core #0.png

      I have discussed it elsewhere. Advice was to contact Intel due to an absence of information relating to my retailer's testing procedures. I have asked about these but am still waiting for a reply.


      So my question is how should I proceed from here? Does this qualify for an RMA? If so is it possible to negotiate this with Intel direct or do I have to go through my retailer?


      I have done my best to make sure I am not doing anything wrong and I would be grateful for any pointers to any mistakes I may be making.

        • 1. Re: How best proceed with overheating i7-4790K?

          Thanks for joining the processor community.

          I understand you have an overheating issue with your processor model i7-4790k.


          If your processor has reached such high temperatures, this means that could be a hardware problem, BIOS issue or even improper installation of the heatsink.

          At this point, I recommend checking some tips about processor overheating at this URL: Processors — What do I do if my computer is overheating?

          If you are still experiencing same problem, you may need to contact Intel support via chat at Contact Support and choose processor area that way you could check warranty options for your processor.



          • 2. Re: Re: How best proceed with overheating i7-4790K?

            Thanks for your reply Allan. Sound advice. Though I have already taken time to check these potential causes its always worth thinking about anything I might have missed. The BIOS is latest F4 version and I reseated the two heatsinks involved several times each. This appears to be a genuine hardware fault but it is currently unknown whether it is in the Mobo or the CPU. Hopefully we can find that out.


            I have an update to add which is that after starting an online chat with my retailer I was able to perform a test using AIDA64 and sent them the output below which resulted in their recommendation that I send the CPU and motherboard to them for testing. You can just about read below that the throttling was at 19% with Intel stock HS/F with the mobo outside the case on a mobo tray. Core Temp recorded 3 of the cores reaching 100°C, expected temps were around 60°C. I reseated the Intel HS three times and it made no difference so CPU and mobo will be going to them on Monday. Hopefully they will replicate and confirm the fault so I won't get charged for the carriage and assessment ! Then hopefully they might find some answers and if they do I will relay them here.



            • 3. Re: How best proceed with overheating i7-4790K?

              Thanks for the information.

              I have informed this overheating problem to our engineering department and they would to fix this matter as soon as possible.

              They would like to know if possible, check on your BIOS screen for Microcode information. If there is any BIOS screen that shows the processor microcode, please post some pictures of it.




              • 4. Re: How best proceed with overheating i7-4790K?

                Thanks for replying and relaying the problem to the engineering dept.


                Unfortunately I sent the CPU and motherboard to my retailer (SCAN) today so I cannot check the microcode identifier myself but I can give you the CPU package ID code which might enable some kind of diagnosis.



                SR219 MALAY L418C133 1718


                I have not changed the microcode so it is presumably the microcode it shipped with, though there was a problem with crossed pins in the socket initially (rectified by replacing the motherboard), I don't know if that could have had an effect. I have alerted SCAN to this thread and the request for microcode information so will relay any if it becomes available.

                • 5. Re: How best proceed with overheating i7-4790K?

                  Update : My retailer Scan tested my CPU and the motherboard together and found an an apparent overheating fault resulting in throttling when they are paired.


                  They also tested an I7 4770K with the same motherboard and it also appears to overheat, suggesting a motherboard issue. The test used was AIDA64 as above.


                  The motherboard  is a Gigabyte Z97MX-Gaming 5 and it has the latest F4 bios which was installed by Gigabyte themselves (I previously sent it off to them for testing for other reasons).


                  The nature of the fault is currently unknown.


                  Product description GByte Z97MX-Gaming 5 MoBo

                  Fault found Yes

                  Scan diagnosis overheating CPUs. i7-4790k and i7-4770 both throttle under AIDA stab test.

                  • 6. Re: How best proceed with overheating i7-4790K?

                    I have received the new mobo and old CPU back from Scan and the CPU is still overheating just as it ever was.


                    I was at a loss to understand how this could happen so I experimented with the memory settings as these were one of the things which may have been different at Scan's end, the results were significant,



                    -With memory at 1333 and 1.5v the AIDA test could be run with stock Intel HS and no thermal throttling, CPU temps reaching a maximum of 94°C.

                    -With memory at 1600 and 1.5v the AIDA test could not be run with stock Intel HS without thermal throttling.  17%

                    -With memory at 1333 and 1.65v the AIDA test could not be run with stock Intel HS without thermal throttling.  3%

                    -With memory at 2400 and 1.65v (XMP) the AIDA test could not be run with stock Intel HS without thermal throttling. 17%



                    Since Intel's memory specification for the CPU is 1333/1600, technically speaking, it still seems to be overheating.


                    I have been able to inspect the CPU in BIOS for ID and update revision numbers.

                    ID#: 000306C3

                    Update revision: 00000019


                    Does that need updating? Or should this CPU be replaced?

                    • 7. Re: How best proceed with overheating i7-4790K?

                      I'm having the same overheating issues with the i7-4790k using a Gigabyte motherboard GA-Z97X-SLI.  Is there a problem with these processors with Gigabyte motherboards or just the processor itself?

                      • 8. Re: How best proceed with overheating i7-4790K?

                        I guess that is the other option chilipalm, which should be considered. I was just hoping someone might already know what the problem is but it looks like I have acquired either a one off perfect storm of  faulty hardware or a cutting edge compatibility problem which has not been recognised and fixed yet for one reason and another.


                        The previous mobo also made a 4770K overheat at SCAN's test center so they replaced it yet the fault remains. So either the CPU by coincidence also has a fault or there is a generic repeatable fault with the mobo and BIOS with the high end CPUs or a compatibility issue which requires both mobo and CPU to be updated. Logic suggests its more likely to be a mobo fault if it also makes the long established 4770K model overheat repeatably but I guess we have to rule out other possibilities to get to that conclusion.


                        So I will have to contact SCAN tomorrow and ask them if they tested the CPU on another mobo and whether they tested the replacement mobo with the CPU after the BIOS was updated, then we need to establish whether this is a generic fault with all these mobos in which case I need to take it to Gigabyte support.


                        EDIT Update, since posting this I have contacted Gigabyte support to ask if they are aware of this overheating as a generic issue and whether they are working on a fix. I am waiting for their response.

                        • 9. Re: How best proceed with overheating i7-4790K?

                          Thanks for the update boolybooly.  An update for me,  I updated my BIOS to F5 for my mobo and found cpu usage has decreased a little bit resulting in temps lowered by maybe 10-15 degrees celcius. However, should cpu usage increase beyond say 35%, temps increase past 80 going into 90s degrees celsius.  I see that we are the guinea pigs on this new processor.  Very poor testing standards by Intel and Gigabyte.

                          • 10. Re: How best proceed with overheating i7-4790K?

                            I also have a gigabyte board, and seem to be having as many issues as these guys.


                            I have a 4790k on a Gigabyte z97x-UD5 with a corsair H100i as a top exhaust in a NZXT h440, using the stock thermal compound on the cooler.  I had even higher temps when I used the intel stock cooler.  All drivers/bios are up to date.


                            My peak temps are reaching 100C across all 4 cores, and apparently throttling down my speed to stay there vCore never breaks 1.17 either, and throttling is between 0 and ~40%


                            • 11. Re: How best proceed with overheating i7-4790K?

                              That is interesting Broxh, you would expect better results with a hydro cooler like the H100i. Have you contacted Gigabyte support about it? I am still waiting for their reply but they usually take a couple of days.

                              Your overheating looks comparable to the kind of problems I am getting, but there is no knowing if they have the same cause at this point. We really need to see if the fault is reproducible on other systems using the same components. My replacement mobo overheating in the same way as the original might seem to indicate that but the CPU is the same one, so it might also have been faulty in the first place and that needs to be ruled out. Also its just possible I got two faulty mobos in a row. I have yet to get confirmation from SCAN that the CPU was tested independantly but the RMA report states it had no fault which suggests it was. However I have no info on whether the replacement mobo was tested as SCAN CS are offline, I phoned but apparently they are busy after the bank holiday etc. I have a support thread on their site so I will wait for them to get get back to me via that.


                              In the meantime I have done some more testing with a better cooler on the replacement mobo. I wrote it up on Hexus.net as they are affiliated with the retailer SCAN. Quote below. In short the Noctua cools better, proving that it is working properly, but the CPU still overheats to the point it shuts down the system, which isn't so good.

                              I tried testing with the Noctua NH-L12 again to see if better cooling would make a difference. I ran the tests at stock + XMP settings with 32Gb of ram (DDR2400, 1.65v).


                              Result in Prime95 was protective thermal shut down of the entire system within 5 seconds of starting the small FFT test. Core Temp showed all four cores showing yellow and about 96°C in the polling interval prior to shutdown, but the polling interval was longer during stress testing and the temperature rose so rapidly its likely that it was higher at shut down. I was so surprised I repeated this test several times with the same result each time.


                              Result in OCCT was that the test was automatically shut down due to reaching the thermal limit of 85°C within 80 seconds of starting the stress part of the test.


                              Result in AIDAx64 was that the test went ahead without thermal throttling, results showing that the cooler was taking at least 14°C off the stock cooler. However Core Temp issued thermal warnings and the max temp reached 86°C on 3 out of four cores.


                              Previously tests using AIDAx64 used the Intel retail HS/F because this is the reference test which SCAN recommended and use themselves. The expected temps with retail HS/F are 60°-70°C. While better cooling allowed the test to be run without throttling, this setup still overheated to much higher temps than expected even with the Intel HS/F and this does not change the fact that this setup fails to run the test without throttling with the Intel cooler reference set up thus failing SCANs test procedure.


                              So it does not change the fact that there is an overheating fault and the real world impact of this problem is evident from the Prime95 and OCCT tests. Even with a better cooler than Intel's there is an unavoidable risk of thermal shutdown in the middle of running an application or game which cannot be considered fit for purpose.


                              So I think its absolutely necessary for me to track down this fault and fix it so the board+cpu are running at normal temperatures to start with. It may be a wider problem than my set up, judging from the reports of other people .... So I feel it is appropriate to suggest it would help if anyone experiencing a problem with overheating could contact their mobo manufacturer technical support to ask for help and make them aware of the issue.

                              • 12. Re: How best proceed with overheating i7-4790K?

                                I am going to test the cooler first, because I have been reading that the H100i doesn't always make a great contact with the processor without some extra washers behind the bracket.  Will update whenever my thermal paste comes in and I can reattach it

                                • 13. Re: How best proceed with overheating i7-4790K?

                                  Thanks for the information; I will forward it to our engineering team.

                                  Please keep in mind that the voltage spec for the embedded memory controller is 1.5v +/- 5% so the results when running memory at 1.65v are not all that surprising.



                                  • 14. Re: How best proceed with overheating i7-4790K?

                                    what is the voltage set too?

                                    You in Manual mode or Adaptive mode?

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