PC Processors

[Dym38025]

Hi there, first time posting. 

I have an AMD Ryzen 5 5600x CPU and it recently started to over heat and crash on boot. I replaced the thermal paste and reinstalled the AIO cooler. That solved the continuous high temp issue and prevented crashes. But I've noticed it still hits over 90°c when first booting up. Sometimes as high as 98°c, it does quickly fall to a reasonable temp once it's booted.

Fans are spinning, cooler seems to be working considering how quickly it cools down.  I can't understand why it would jump that high on boot, I don't remember it ever going that high before the issue started. 

Any troubleshooting suggestions for this?

Pc specs:

Gigabyte B550 UD AC motherboard

RXT 3070

Nzxt 120mm AIO

2 sticks of ram DDR4 8 GB

[432hz · Accepted solution]

Did you perform a BIOS / chipset update before the problem started? You could try a CMOS reset and looking for any "auto boost / auto OC" features your motherboard has and that may be enabled.

The BIOS PBO is a good place to start that is common across AMD mobos. I believe by default PBO runs the CPU as high as possible given the cooling. You can disable PBO or try an undervolt: https://www.youtube.com/watch?v=dfkrp25dpQ0

[elstaci]

Sounds like your Nzxt 120 MM AIO pump is either sticking when first started when powering up or your are not getting the proper PSU output 12 Vdc to the pump at first.

Could also be your Radiator Fan is not starting up when first booting up similar to the possible pump issue.

Either way I would open a Nzxt Warranty Support ticket and see if your AIO needs to be replaced.

I would download OCCT and run all 3 tests and check for Temperatures, Pump and Fans speeds, and PSU Outputs during all testing modes.

It might be able to tell you if your AIO is going bad or not.

Best way to check if your AIO is bad or not is by installing a AIR CPU Cooler rated TDP of 150 Watts or higher and see if the same thing occurs.

NOTE: In my opinion, Your processor shouldn't overheat at all with a 120 MM AIO installed. Your processor has a TDP rating of only 65 Watts.  Your Processor temps should be below 70c under any loads.

By the way the Maximum Operating Temperature of your processor is 95c so if it hovers around 90c it is still within its normal operating temperature range but quite high and almost overheating state.

[Dym38025]

Thanks, I'm looking to replace the AOI sooner then later either way.

[Dym38025]

I did recently have to update the Bios. I didn't run the Q flash feature my board has when I did. I'm new to the PC space and I know Bios updates can be risky so I didn't wanna fool around too much.

But I found the PBO setting you mentioned, disabled that and it looks like my boot temps have seriously decreased! Thank you!

[432hz]

Glad to hear it.

With that said, @elstaci's  analysis makes sense to me and I suggest taking that advice.

Do note that your performance will be worse with PBO disabled. Depending what you use your PC for, you may want to look into the PBO undervolt while you sort out cooling.

Lastly, if you have the same problem with new cooling, I'd look to reflash the BIOS with the latest non-beta version and make sure you have the latest chipset drivers installed from AMD.