AMD Motherboards - SVM Mode On + HyperV Install => BCLK unstable

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SVM Mode On + HyperV Install => BCLK unstable

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=8615
Printed Date: 04 Nov 2025 at 5:49pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: SVM Mode On + HyperV Install => BCLK unstable

Posted By: TrakRailySurely
Subject: SVM Mode On + HyperV Install => BCLK unstable
Date Posted: 06 May 2018 at 9:34am

" rel="nofollow - Hi.

I installed it because I want to use virtual environment Hyper-V.

I activated CPU SVM in the BIOS.

When SVM was enabled, BCLK was fixed,

Installing Hyper-V will make BCLK unstable.

Is there the same phenomenon?

Why did you fix it?

Help me.

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Windows 10 Pro April 2018 Update (Build 17134.5)

Ryzen 7 1700

X370 Gaming K4

Power Plan : AMD Ryzen Balance Plan

Stable BCLK Clocks -> 99.84

UnStable BCLK Clocks -> 97.86 - 98.47

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Replies:

Posted By: wardog
Date Posted: 06 May 2018 at 10:29am

I have seen that here. As others on the net have too.

It is my understanding that this is a normal occurrence as SVM is completely contained and executed within the processor itself.

I've also personally experienced my OC's be hampered with SVM Enabled, FWIW.

Posted By: wardog
Date Posted: 06 May 2018 at 10:33am

Sorry. Had to grab a backup drive to locate this in-depth link to understand.

https://www.anandtech.com/show/2480/9" rel="nofollow - https://www.anandtech.com/show/2480/9

hth

Posted By: avinicius
Date Posted: 28 Sep 2018 at 2:46am

Same thing happens with my AB350M Pro4, tested with BIOS 4.70 and 5.00.

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AMD Ryzen 5 2400G | ASRock AB350M Pro4 | G.SKILL Ripjaws V @ 3000 MT/s 16-16-16-35 (2x8 GiB) | Seasonic S12II-430

Posted By: xhue
Date Posted: 28 Sep 2018 at 2:59am

It's 'normal' or at least - expected. AFAIK SVM and other VM stuff abstracts or hides the real HW and clocks/timers from both host and guest. IDK, might be wrong.

I believe BLCK is actually ticking at a stable rate, it's just a matter of readings and reporting. Or I may be totally wrong.

I'll be dropping a ticket to ASRock. I advise you all to do the same.