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willyfisch
Adept III
Adept III

Ryzen 1800x water cooled throttling issue

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Hello there

I've been having issues with my Ryzen CPU throttling for a few weeks now, which I did not have before. I don't know since when I have it, maybe a BIOS update, but I hope someone here has an idea what can be causing this:


First of all, my speccs are:
Ryzen 7 1800x (custom water loop)

Asus Crosshair VI Hero (BIOS 9920)

Corsair Vengeance LED 2x 16GB, DDR4-3000

The problem is, the CPU instantly throttles as soon as it gets heavy load, even on moderate overclock (for example 4.0 Ghz). The multiplier starts jumping around between -0x, -0.25x, -0.5x, -0.75x, -1x, -1.25x on several random cores (full load scenario):

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It gets worse after running on load for a while.

On heavier overclock with overvoltage etc. (4.1Ghz) it's also even worse.

On top of that, I also get overheating throttling issues with heavy overclock. So the tCTL sensor shows 20° higher temp on all monitoring software compared to Ryzen Master. As soon as this sensor reports 95°, or 75° on Ryzen master respectively, it'll throttle to keep the temps down. I'm confused because I thought Ryzen Master is showing the "real" temperature and it would throttle at 95° Ryzen Master temperature, not 75°.

I had none of these problems before. I could run P95 for 24 hours at 4.06Ghz on all cores with no issues or overheating.

Message was edited by: Matt B

We have updated the title of this discussion with relevant details to better describe your issue.

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black_zion
Esteemed Contributor III

Re: Ryzen throttling issue

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Ryzen Master and ASUS AI Suite both report the real temperature. It is possible the BETA BIOS you are using is causing sensor errors, flash back to the last stable version to rule it out.

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6 Replies
black_zion
Esteemed Contributor III

Re: Ryzen throttling issue

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Ryzen Master and ASUS AI Suite both report the real temperature. It is possible the BETA BIOS you are using is causing sensor errors, flash back to the last stable version to rule it out.

View solution in original post

willyfisch
Adept III
Adept III

Re: Ryzen throttling issue

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Thank you, this solved the issue. I should have thought about that myself, but when I tried BIOS reset to default, it didn't solve it. Actually reflashing the BIOS did solve it, so something must have messed up my BIOS.

Also, no more throttling at 75° now, I pushed it to 77° just to try and it was all fine.

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rwd4ever
Adept III
Adept III

Re: Ryzen throttling issue

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The SenseMI is more complex than thermal throttling. It is also monitoring power draw. I imagine it might slow down the core if using AVX instructions, but I can't find any details concerning this.

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black_zion
Esteemed Contributor III

Re: Ryzen throttling issue

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Intel takes a clock penalty, AMD does not.

will Ryzen next generation have decent AVX?

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rwd4ever
Adept III
Adept III

Re: Ryzen throttling issue

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Depends which processor: the new platinum Xeon slows down a little for AVX256, then some more for AVX512.  I can't find anything in Intel's documentation that Skylake desktops do. It seems they will just cook themselves until thermal throttling kicks in.

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willyfisch
Adept III
Adept III

Re: Ryzen throttling issue

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I did some further investigation and found out, that setting the CPU multiplier to 36x or lower causes this issue.

I need to overclock with Ref Clock to get my RAM speeds up and right now I can't get any higher on the RAM speed because the CPU clock gets too high on 36.25x.

Is this a bug from AMD or from ASUS BIOS or is it a "feature"?

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