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Z370: Resizeable BAR decreases performance

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Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
Printed Date: 01 Mar 2024 at 10:22am
Software Version: Web Wiz Forums 12.04 -

Topic: Z370: Resizeable BAR decreases performance
Posted By: 27182
Subject: Z370: Resizeable BAR decreases performance
Date Posted: 01 Apr 2021 at 11:22pm
Hello, having issues with Resizeable BAR.

My hardware

Z370 Extreme4, BIOS 4.21B
i9 9900K, stock clocks, 1.2V
RTX 3080 FE, 1900MHz @ 0.9V

With everything updated (BIOS 4.21B, vbios updated, latest Geforce driver), I enabled Resizeable BAR (verified through Nvidia Control Panel and GPU-Z).

Then I tried to evaluate the performance increase in Horizon Zero Dawn and RDR2. In both case ReBAR decreases my fps.

Horizon Zero Dawn

ReBAR OFF : 125 FPS Average" rel="nofollow -

ReBAR ON : 111 FPS Average" rel="nofollow -

Red Dead Redemption 2

ReBAR OFF : Min 38.2 Max 136.6 Mean 97.5

ReBar ON : Min 35.5 Max 121.0 Mean 96.4

Disappointed with the results, I'll leave ReBAR off for now.

Can anyone share their results on this platform£
ASRock, is this expected£

Posted By: 27182
Date Posted: 02 Apr 2021 at 6:04pm
On the graphs, it seems CPU performance lowers when ReBAR is active, which leads to lower FPS even if GPU performance increases.
Any help£

Posted By: 27182
Date Posted: 04 Apr 2021 at 5:33pm
I got feedback from another user with similar hardware (Z370 Extreme4 - 9900k - 3090 FE).
He had similar observations.
Note that this performance drop is more obvious at resolutions of 1440p and lower.

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