AMD Motherboards - BIOS slow + low-res (B550SL 3.40)

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BIOS slow + low-res (B550SL 3.40)

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=87698
Printed Date: 06 Sep 2025 at 7:20am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: BIOS slow + low-res (B550SL 3.40)

Posted By: matthys70
Subject: BIOS slow + low-res (B550SL 3.40)
Date Posted: 28 Dec 2024 at 7:07pm

Hello,

I recently upgraded the CPU for my ASRock B550 Steel Legend with the AMD Ryzen 7 5800X.
To be sure I also upgraded the BIOS to latest (stable) version: P3.40

But now I notice this behaviour and wonder if this is normal or if there is a fix;

The Post BIOS screen (with logo and option to enter BIOS or Boot Manager) is in high-res. But as soon as I enter the BIOS it's low resolution in 1024x768. Also to get into BIOS is very slow. It really takes ages after hitting F1 or Del key.

What I noticed is if I change the BIOS option for CSM (Boot\CSM = Compatibility Support Module) to disable I get low-res as mention above. But if I enable (the default?) the Post screen is low-res but into BIOS it's 1980x1080.

For now I have set the CSM to disabled, as I'm using Windows 11.
But still wonder why it's so slow and why the difference in resolution.

Thanks,
Matthijs