Z370: Resizeable BAR decreases performance

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   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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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: 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.

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: 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£