Clocking my 1950x below 3400mhz resets it to stock
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=12815
Printed Date: 05 Aug 2025 at 9:29pm
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Topic: Clocking my 1950x below 3400mhz resets it to stock
Posted By: duke
Subject: Clocking my 1950x below 3400mhz resets it to stock
Date Posted: 05 Nov 2019 at 10:33am
Hi,
I have a problem with downclocking/undervolting my Threadripper 1950x. If I set the core clock in BIOS manually to 3.40 Ghz or below, once I boot into Window the CPU behaves as if everything is on Auto - the CPU boosts up to 4.10 Ghz. The core voltage is also anywhere between 1.10V and 1.50V so it looks like it's on Auto too even though I've set a Manual value of 1.00 in BIOS. After rebooting back into BIOS, the values are still set to Manual 3400 and Manual 1.00V core voltage. Really strange.
Any ideas why does this happen and how to avoid it? I want to be able to fix my CPU to 3.40 Ghz at all times and also set manual CPU core voltage at this clock speed of 1.0-1.05V.
My motherboard is X399 Taichi with the latest BIOS as of now. OS is Windows 10 x64 Pro version 1903.
Thanks in advance!
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Replies:
Posted By: Ray62
Date Posted: 08 Nov 2019 at 5:33am
You probably have also to disable dynamic clocking features like Core Performance Boost, PState handling etc.
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Asrock Fatal1ty X370 Professional Gaming Offline
Under test:
MSI X570_MEG_ACE | AMD Ryzen 9 3900X | Scythe Mugen5 | 2x16GB F4-3200C14D-32GTZ@3466 | ASUS GeForce GTX 1080 Ti FE
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Posted By: duke
Date Posted: 09 Nov 2019 at 9:18pm
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Thanks for the tip. I tried disabling Core Performance Boost, but it did nothing. I couldn't find the option Pstate handling though. Do you know where it's located in the BIOS?
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Posted By: Ray62
Date Posted: 09 Nov 2019 at 10:07pm
Under the Bios of my X370 it's there where you can configure Core Performance Boost.
Advanced\AMD CBS\Zen Common Options
If not known, maybe for further infos:
https://www.overclock.net/forum/11-amd-motherboards/1638140-asrock-x399-taichi-fatality-overclocking-unofficial-support.html
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Asrock Fatal1ty X370 Professional Gaming Offline
Under test:
MSI X570_MEG_ACE | AMD Ryzen 9 3900X | Scythe Mugen5 | 2x16GB F4-3200C14D-32GTZ@3466 | ASUS GeForce GTX 1080 Ti FE
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Posted By: duke
Date Posted: 12 Nov 2019 at 8:01am
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Thanks, but as I already mentioned, I tried disabling Core Performance Boost, but it did nothing. You said something about the option Pstate handling, but I don't see this in the BIOS. Do you know where it's located and if this will help me fix the clocks speed at 3400 mhz as well as the core voltage?
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Posted By: Ray62
Date Posted: 12 Nov 2019 at 1:45pm
In my bios it is under Advanced\AMD CBS\Zen Common Options like i already posted, the same path where i can find Core Performance Boost.
-> Custom Pstates / Throttling
That can be different in your bios.
However, i haven't used a threadripper yet.
I would use the already posted overclock.net link, there should be some users using allcore frequency settings with the same mainboard at least for testing the max, frequency they can get out from their TR. And if not, start a thread there.
Just a suggestion.
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Asrock Fatal1ty X370 Professional Gaming Offline
Under test:
MSI X570_MEG_ACE | AMD Ryzen 9 3900X | Scythe Mugen5 | 2x16GB F4-3200C14D-32GTZ@3466 | ASUS GeForce GTX 1080 Ti FE
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Posted By: Ray62
Date Posted: 12 Nov 2019 at 2:21pm
A german video showing a TR with 4GHz allcore setup with pstate setting in the bios:
https://youtu.be/83brAYq2uzE
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Asrock Fatal1ty X370 Professional Gaming Offline
Under test:
MSI X570_MEG_ACE | AMD Ryzen 9 3900X | Scythe Mugen5 | 2x16GB F4-3200C14D-32GTZ@3466 | ASUS GeForce GTX 1080 Ti FE
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