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Resize Bar support for B450£

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Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
Printed Date: 22 May 2024 at 5:15pm
Software Version: Web Wiz Forums 12.04 -

Topic: Resize Bar support for B450£
Posted By: radry
Subject: Resize Bar support for B450£
Date Posted: 12 Sep 2023 at 10:00pm
So some B450 Mainboards (Asus) support resize bar with a Ryzen 3000 CPU via Bios update.

Will Asrock B450 Boards (specifically the Fatal1ty B450 Gaming-ITX) support it too some day?

I noticed a beta bios 8.01 which seems like a large Version jump from the current 5.20 when it only updates AGESA. There must be other, hidden changes or not? Does it maybe include resize bar?

Posted By: kerberos_20
Date Posted: 12 Sep 2023 at 11:10pm
re-bar is supported on your mainboard since agesa V2, that would be bios version 4.40
if you dont see it, then you dont meet minimum requirements to enable it
ryzen 3000 or better (not including 3400G/3200G)
above 4G decoding needs to be enabled
CSM needs to be disabled
operating system needs to be installed in UEFI mode on GPT drive
GPU RX 6000 or better or nvidia RTX 3000 or better, but on nvidia only like 30 games have enabled rebar due to performance issues

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Posted By: eccential
Date Posted: 12 Sep 2023 at 11:11pm
Umm, Asrock B450 boards have supported Resize Bar (also known as Smart Access Memory) for a long time now.

You have to disable CSM, and then enable "Above 4G Decoding" + "Resiable Bar."

Posted By: radry
Date Posted: 12 Sep 2023 at 11:44pm
Thank you, I must have completly overlooked that.

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