https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sun, 19 Apr 2026 13:02:10 +0000 Fri, 21 May 2021 19:47:01 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=18780 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=18780&PID=87257&title=disable-specific-core-on-am4-b450m#87257 Author: kleech
Subject: 18780
Posted: 21 May 2021 at 7:47pm

Thank you for the replies, both were very helpful.

datonyb wrote: should be in your user manual or you could install ryzen master to disable ccx

Indeed, in the manual there should be Advanced->AMD CBS->Zen common options->Downcore control. But on my system there is no "Zen common options" for some reason, so can't boot windows, so can't use ryzen master...

ThreeDee wrote: https://www.amd.com/en/support/kb/warranty-information/pib

I think this is my option, now waiting for the answer from RMA team.]]> Fri, 21 May 2021 19:47:01 +0000 https://forum.asrock.com/forum_posts.asp?TID=18780&PID=87257&title=disable-specific-core-on-am4-b450m#87257 https://forum.asrock.com/forum_posts.asp?TID=18780&PID=87104&title=disable-specific-core-on-am4-b450m#87104 Author: ThreeDee
Subject: 18780
Posted: 14 May 2021 at 4:59pm

https://www.amd.com/en/support/kb/warranty-information/pib]]> Fri, 14 May 2021 16:59:01 +0000 https://forum.asrock.com/forum_posts.asp?TID=18780&PID=87104&title=disable-specific-core-on-am4-b450m#87104 https://forum.asrock.com/forum_posts.asp?TID=18780&PID=87016&title=disable-specific-core-on-am4-b450m#87016 Author: datonyb
Subject: 18780
Posted: 11 May 2021 at 11:27pm

should be in your user manual

or you could install ryzen master to disable ccx]]> Tue, 11 May 2021 23:27:02 +0000 https://forum.asrock.com/forum_posts.asp?TID=18780&PID=87016&title=disable-specific-core-on-am4-b450m#87016 https://forum.asrock.com/forum_posts.asp?TID=18780&PID=86921&title=disable-specific-core-on-am4-b450m#86921 Author: kleech
Subject: 18780
Posted: 08 May 2021 at 5:22am

Hello.
I have ASRock B450M Pro4-f motherboard with Ryzen 9 3900x. This CPU has 5th core malfunctioning. It's able to boot OS if i disable this specific core in linux kernel options. I want to use Windows, in which same is tricky, if possible at all.
Is there any way to lock or disable specific CPU core or CCX in BIOS/UEFI in this motherboard?]]> Sat, 08 May 2021 05:22:32 +0000 https://forum.asrock.com/forum_posts.asp?TID=18780&PID=86921&title=disable-specific-core-on-am4-b450m#86921