Z370: Resizeable BAR decreases performance

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   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
https://image.noelshack.com/fichiers/2021/13/4/1617288924-capture-d-ecran-2021-04-01-16-28-02.jpg

ReBAR ON : 111 FPS Average
https://image.noelshack.com/fichiers/2021/13/4/1617288944-capture-d-ecran-2021-04-01-16-52-08.jpg

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£

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27182 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Mar 2021 Status: Offline Points: 95	Post Options Post Reply Quote 27182 Report Post Thanks(0) Quote Reply Topic: Z370: Resizeable BAR decreases performance 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 https://image.noelshack.com/fichiers/2021/13/4/1617288924-capture-d-ecran-2021-04-01-16-28-02.jpg ReBAR ON : 111 FPS Average https://image.noelshack.com/fichiers/2021/13/4/1617288944-capture-d-ecran-2021-04-01-16-52-08.jpg 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£

27182 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Mar 2021 Status: Offline Points: 95	Post Options Post Reply Quote 27182 Report Post Thanks(0) Quote Reply 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£

27182 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Mar 2021 Status: Offline Points: 95	Post Options Post Reply Quote 27182 Report Post Thanks(0) Quote Reply 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.