Originally posted by Areteic
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x570 Aorus Master on F33A + 3900x + rtx3080
So by having CSM disabled and Above 4G Decoding enabled there is videocard performance drop. It is very noticeable with Vulkan games (tested Serious Sam 4, Doom 2016) for up to 50% fps loss. GPU usage stays around 40-50% too. DirectX games suffer from frequent stutters but don't lose that much fps.
I tried different drivers for videocard and it made no difference so it's not that. I know there is still no support for Resize Bar on Nvidia card but "Above 4G Decoding" option alone should not lead to this drastic performance loss.
With a little Google-Fu I found that certain MSI motherboards on B450 chipset suffered from same issue with "Above 4G Decoding" option - here's the thread - I experience same results as in opening post. In the post it says they had Vega 56 card so it is not videocard's fault. Also in that forum thread they discuss that options "MMIOH Base" and "MMIO High Size" should resolve the issue but I couldn't find anything resembling in my BIOS (or maybe they are called different, I don't know)
Can this be fixed? Is there anything I can provide to help identifying cause of issue?
UEFI/CSM mode | Above 4G Decoding | Effect |
UEFI | Disabled | Nothing unusual |
UEFI | Enabled | Videocard performance degradation. |
CSM | Enabled | Nothing unusual |
So by having CSM disabled and Above 4G Decoding enabled there is videocard performance drop. It is very noticeable with Vulkan games (tested Serious Sam 4, Doom 2016) for up to 50% fps loss. GPU usage stays around 40-50% too. DirectX games suffer from frequent stutters but don't lose that much fps.
I tried different drivers for videocard and it made no difference so it's not that. I know there is still no support for Resize Bar on Nvidia card but "Above 4G Decoding" option alone should not lead to this drastic performance loss.
With a little Google-Fu I found that certain MSI motherboards on B450 chipset suffered from same issue with "Above 4G Decoding" option - here's the thread - I experience same results as in opening post. In the post it says they had Vega 56 card so it is not videocard's fault. Also in that forum thread they discuss that options "MMIOH Base" and "MMIO High Size" should resolve the issue but I couldn't find anything resembling in my BIOS (or maybe they are called different, I don't know)
Can this be fixed? Is there anything I can provide to help identifying cause of issue?
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