Clocking my 1950x below 3400mhz resets it to stock

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   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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duke Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Oct 2017 Status: Offline Points: 16	Post Options Post Reply Quote duke Report Post Thanks(0) Quote Reply Topic: Clocking my 1950x below 3400mhz resets it to stock 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!

Ray62 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 01 Jul 2018 Location: Germany, Berlin Status: Offline Points: 706	Post Options Post Reply Quote Ray62 Report Post Thanks(0) Quote Reply Posted: 08 Nov 2019 at 5:33am
	You probably have also to disable dynamic clocking features like Core Performance Boost, PState handling etc.
	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

duke Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Oct 2017 Status: Offline Points: 16	Post Options Post Reply Quote duke Report Post Thanks(0) Quote Reply Posted: 09 Nov 2019 at 9:18pm
	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?

Ray62 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 01 Jul 2018 Location: Germany, Berlin Status: Offline Points: 706	Post Options Post Reply Quote Ray62 Report Post Thanks(0) Quote Reply 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
	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

duke Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Oct 2017 Status: Offline Points: 16	Post Options Post Reply Quote duke Report Post Thanks(0) Quote Reply Posted: 12 Nov 2019 at 8:01am
	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?

Ray62 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 01 Jul 2018 Location: Germany, Berlin Status: Offline Points: 706	Post Options Post Reply Quote Ray62 Report Post Thanks(0) Quote Reply 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.
	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

Ray62 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 01 Jul 2018 Location: Germany, Berlin Status: Offline Points: 706	Post Options Post Reply Quote Ray62 Report Post Thanks(0) Quote Reply 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
	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