AMD Motherboards - Smart Access Memory

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Smart Access Memory - B550M PRO4

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=26098
Printed Date: 04 Nov 2025 at 10:50am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Smart Access Memory - B550M PRO4

Posted By: r8ermang
Subject: Smart Access Memory - B550M PRO4
Date Posted: 04 Jul 2023 at 3:45am

Hello,

Trying to enable SAM, however, the BIOS is asking me to disable CSM before enabling SAM. When I do that, I cannot boot into WIndows.

R5 5600x
B550M Pro4
6700XT

Thanks

Replies:

Posted By: eccential
Date Posted: 04 Jul 2023 at 6:20am

It is apparently possible to convert an existing install from MBR (Master Boot Record) to GPT (GUID Partition Table - I hate it when a short-hand contains another short-hand).

https://learn.microsoft.com/en-us/windows-hardware/drivers/bringup/switch-from-legacy-mbr-disk-to-gpt-disk-with-windows-10" rel="nofollow - https://learn.microsoft.com/en-us/windows-hardware/drivers/bringup/switch-from-legacy-mbr-disk-to-gpt-disk-with-windows-10

But I can imagine things going bad on a drop of a hat.

If you're going to attempt this, make sure you have viable backups of everything. You could also consider this an opportunity to clean-install everything. Make sure to DISABLE CSM before you start the installation process, or you'd be back to square one after all that work.