[Nvidia] Resizable bar fixed the extreme fps issues I had this league (abyss still drops to ~60fps)

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murzyn97#0598 wrote:

I don't have 0x0000000280000000 value in rBAR size limit, what should i do?

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Haziza#1519 wrote:

Rebar is on by default on modern systems, pointless fix.

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green_bloodshed#1928 wrote:

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Fatbelly#2936 wrote:

I am one of those with a high end perfectly stable system, that used to run previous leagues almost perfectly smooth limited to 120 fps most of the time (rtx 5090 +a 285k stable overclocked cpu in 3dmark hall of fame top100).

Latest drivers/bios/windows etc etc and no issues in other games, but this league has had extreme fps drops even with all settings/sound channels minimum in all content, most extreme in abyss which sometimes dips to 20fps.

Tried all random fixes thrown around such as switching to vulkan, switching to DX12, windowed, fullscreen, clearing shader cache, unlimited shader cache, disabling shader cache, 100Gb shader cache, disabling dlss, disabling nvidia reflex etc etc, nothing works, but clearly something happens and its mildly better for a while when shader cache is cleared.

I had the exact same issue in another game and the solution there was enabling resizable bar (makes perfect sense rebar should affect this since it allows the CPU to access the GPU's full/limited vram which would typically be used to stream shaders from cache etc).

Ingame: DX12, nvidia reflex/dlss (dlss probably optional).
Nvidia inspector; common
rBAR - Enable
rBAR options - 0x00000001 (Returnal, Red dead Redemption 2)
rBar size limit - 0x0000000280000000

(I used 10GB since I know it performs well for my 5090, this depends on your VRAM, many defaults use 1GB so maybe "safest bet)
Ignore the game names in above options, it is simply to enable it.

10GB
0x0000000280000000
4GB
0x0000000100000000
2GB
0x0000000080000000
1GB
0x0000000040000000

With this applied the performance is "Normal" again, instead of rollercoaster frametimes and 20 fps in abyss at minimum settings, I could go back to normal/high settings with stable-ish 120 fps which instead drops to a playable 50-60 fps in the worst abyss areas.

If I had to guess I would say poe's shader cache is designed and tested for resizable bar, or at least during a time period when rbar was enabled by default - but nvidia for some reason by default disables resizable bar in newer drivers and this could also likely be why some people report rolling back to older drivers work?

Hope this helps anyone, worked fine all evening for me and seemed to work for a couple of people with big issues and nvidia gpu's I asked to try as well.

(This needs to be applied after every nvidia driver update until nvidia decides to make it default on again).

I don't understand. Are these settings in Nvidia control panel, or what?