Ryzen 7 3700x constantly changes temp at idle in uniform cycles... Help pls - Overclock.net - An Overclocking Community
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Ryzen 7 3700x constantly changes temp at idle in uniform cycles... Help pls

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post #1 of 17 (permalink) Old 01-15-2020, 06:34 PM - Thread Starter
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My brand new build is having an odd problem. The CPU temp is spiking to about 40 degrees, then cooling off 1 degree per second or so until hitting 30, then immediately spiking to ~40 again. Over and over, at idle. See the Afterburner chart attached.

Specs:
Board: MSI MEG x570 Unify
CPU: Ryzen 7 3700x
RAM: Trident Z Neo 32gb 3200
GPU: 2x MSI GTX 1070 in SLI (tried single card, this still happens)
CPU cooler: Deepcool Captain 240 RGBv2 AIO
PSU: Corsair RM850x
Great airflow with 3 intake and 3 exhaust fans total.

Anyone have any ideas?

Edit: I just loaded up Witcher 3 and it doesn't seem to be a bad cooler or anything, even at boost of 4300mhz and 30% usage the CPU is under 50c. Why is it temp cycling at idle up to 40...?
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Last edited by RomeSC; 01-15-2020 at 06:41 PM. Reason: More info
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post #2 of 17 (permalink) Old 01-15-2020, 06:45 PM
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I think your 3700x has grown a mind and is trying to speak to you, them there are sawtooth waves if I've ever seen them.

seriously, no idea.

Does this same behavior show in other monitors besides AB? Namely Ryzen Master?

Which power plan? Have you tried changing it?

Are you on the latest bios, 7C35vA2 ??

Can't hear my delta fans over my Death Metal crew
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post #3 of 17 (permalink) Old 01-15-2020, 07:01 PM - Thread Starter
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Quote: Originally Posted by Serious_Don View Post
I think your 3700x has grown a mind and is trying to speak to you, them there are sawtooth waves if I've ever seen them.

seriously, no idea.

Does this same behavior show in other monitors besides AB? Namely Ryzen Master?

Which power plan? Have you tried changing it?

Are you on the latest bios, 7C35vA2 ??

It shows on my motherboard debug code led, which changes to a temp gauge after boot. That's how this conundrum was discovered. It also shows this in dragon center, with the corresponding CPUFAN rpm jumps to compensate.

Don't know about the bios stuff. Never messed with a bios update. Uploaded a pic of current bios info. It's not exactly what MSI site shows (what you typed) but it has a build date only one day before that one? I call MSI support about this and he said he didn't know why the temps would be jumping like that (shocker).
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post #4 of 17 (permalink) Old 01-15-2020, 07:23 PM
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That's the latest bios A2, release date was probably just posted on their website a day after that build was compiled

Super weird. I notice that the temp is 27C while in the bios, so I'm wondering if this would happen outside of windows. Might have something to do with the windows power plan setting and/or chipset driver. Changing power plans and reinstalling chipset drivers would be my first stop, but that's just taking shots in the dark. I'd also try disabling PBO or any other extra bios features (Default settings..) if you have them on just to see what happens.

Fans increasing to compensate are probably just a side effect due to the factory CPU fan profile, you could likely customize the curve to make it flat throughout the 30-40C range and stop that. That board should have a pretty decent UI in the bios for setting a custom fan curve.

30-40C are pretty normal temps for these, but mine (3700x) is whipping around randomly from 35C to 45C while I type this, not in some strange linear pattern.

I don't think you have anything to worry about as long as it's working properly under load and not causing jerkiness when changing power states, etc.. Worst case is a wonky thermal sensor

Can't hear my delta fans over my Death Metal crew
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Last edited by Serious_Don; 01-15-2020 at 07:26 PM.
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post #5 of 17 (permalink) Old 01-15-2020, 07:28 PM - Thread Starter
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Quote: Originally Posted by Serious_Don View Post
That's the latest bios A2, release date was probably just posted on their website a day after that build was compiled

Super weird. I notice that the temp is 27C while in the bios, so I'm wondering if this would happen outside of windows. Might have something to do with the windows power plan setting and/or chipset driver. Changing power plans and reinstalling chipset drivers would be my first stop, but that's just taking shots in the dark.

30-40C are pretty normal temps for these, but mine (3700x) is whipping around randomly from 35C to 45C while I type this, not in some strange linear pattern.

I don't think you have anything to worry about as long as it's working properly under load and not causing jerkiness when changing power states, etc.. Worst case is a wonky thermal sensor
I just installed the newest x570 chipset drivers. No change.

Tried changing the power settings (like balanced, high performance, etc ) if that's what youre referring to. No change.

In the bios the temp stays stable at 27c. In windows it's randomly boosting too but it seems random fluctuations between 3600 and 4300, not synced to the temp changes.

This build was a major, major expense for me. I'm having a hard time not worrying that this weird problem is a sign that something isn't working right and I should be fixing it/replacing something while I can RMA it... I plan to use this rig for at least 5 years, can't help but worry about it. Seems so odd.

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post #6 of 17 (permalink) Old 01-15-2020, 07:38 PM
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I don't blame you, I have a very similar rig and also want 5 years out of it.

I would voice that concern with MSI, I don't see why it would be a big deal for them to RMA it. Tell them what you just told me, it makes you very uncomfortable since you want to have it last 5 years. At least it would narrow down whether or not it's specific to your board.

Only alternative is to keep troubleshooting.. default the bios, reinstall windows or see if this happens under linux / other version of windows, disconnect everything not required to run the system, etc.. Wish I could help you more but this is an odd one.

Can't hear my delta fans over my Death Metal crew
I Just Found Out My PCs Have A Power Button. Meh, Still Not Shutting Down Club Member #00001
In the beginning were the words and the words made the world. I am the words. The words are everything. Where the words end the world ends. You cannot go forward in the absence of space. Repeat.
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post #7 of 17 (permalink) Old 01-15-2020, 07:48 PM - Thread Starter
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Quote: Originally Posted by Serious_Don View Post
I don't blame you, I have a very similar rig and also want 5 years out of it.

I would voice that concern with MSI, I don't see why it would be a big deal for them to RMA it. Tell them what you just told me, it makes you very uncomfortable since you want to have it last 5 years. At least it would narrow down whether or not it's specific to your board.

Only alternative is to keep troubleshooting.. default the bios, reinstall windows or see if this happens under linux / other version of windows, disconnect everything not required to run the system, etc.. Wish I could help you more but this is an odd one.
I'm sure MSI would take it of I pushed... but an RMAd motherboard... Ugh. Essentially rebuilding the entire PC. Sounds awful. The Linux piece is a good idea. That should determine for sure if it's hardware or software right?

I'm just racking my brain here... If the CPU couldn't help itself it would be doing it in the bios too right? If the cooler was poorly contacting or not effective it would be spiking terribly in gaming. I don't get it.

This is what I get for hopping on the hype train and going AMD for the first time in my life. A super bizarre CPU-based problem. Thanks for your replies so far. It's helpful.

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post #8 of 17 (permalink) Old 01-15-2020, 08:20 PM - Thread Starter
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Do you core voltages fluctuate at idle? Mine is bouncing between 1.1 and 1.4 in dragon center again seemingly at random, as is the multiplier and therefore core speed per CPUZ.

Think setting a constant voltage and clock speed and locking it here would help? I don't know anything about AMD cpus.

EDIT..... In dragon center there is a hardware monitor option. I clicked that, then at the top there is a drop-down arrow. Click that and you can set a profile (balanced, extreme performance, etc). I set it to extreme and the fan shootsto 100 percent but the CPU kept cycling temps impossibly. Set it back to balanced and... Viola! It's now staying dead at 28c. I don't understand, but I'm not complaining!!! Hopefully it stays this wayyyyy

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Last edited by RomeSC; 01-15-2020 at 08:26 PM.
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post #9 of 17 (permalink) Old 01-15-2020, 08:27 PM
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If it's still happening in Linux I would probably blame the bios or board given that other people with that same board might not have this problem.

Let me get back to you on the idle voltage, have a large compilation going so it's under load.

Re setting a constant voltage, that may work and so may disabling Cool & Quiet in your bios, only issue is the CPU will probably idle at higher temps. I didn't mention that because I don't see how that would cause your temps to cycle down 1 degree in 1 second intervals followed by shooting back up to 40C.

Edit --- AH! Maybe there is some conflict happening between your MSI dragon software & Windows power plan settings. I didn't think of that program

Can't hear my delta fans over my Death Metal crew
I Just Found Out My PCs Have A Power Button. Meh, Still Not Shutting Down Club Member #00001
In the beginning were the words and the words made the world. I am the words. The words are everything. Where the words end the world ends. You cannot go forward in the absence of space. Repeat.
HAF Baked
(16 items)
M-M-Monster Kill
(13 items)
CPU
3700x [CSCoder4ever Edition]
Motherboard
Gigabyte X570 Aorus Pro Wifi
GPU
MSI GTX 1080 Sea Hawk EK X [Iamjanco Edition]
RAM
DDR4 3600 CamoRamo [Pook Edition]
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Asus
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Last edited by Serious_Don; 01-15-2020 at 08:31 PM.
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post #10 of 17 (permalink) Old 01-15-2020, 08:31 PM
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It's normal Ryzen behaviour since the first generation. You can search for 'Ryzen sawtooth' or something similar. The CPU does something internally every few seconds and it causes the temp spike which is noticeable in idle scenarios.
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