Resizable bar and GHS do not work

Software & Operating Systems Windows
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1

Hello world.

I have my PC where I now recently tried to get the Resizable BAR and Graphics accelerated Hardware scheduling to work. Having two problems here. GHS is not showing up under System-Display-Graphics settings. And setting Resizable BAR on auto in Bios does not properly enable it, it should work if the resources tab would show you Large memory range. But I only have medium ones. To enable GHS, I added the 32DWORD to the registry. But I am unsure if it works. I want to get both of them working.

Windows 10 Pro 21H1
R5 5600X
RX5700XT
X570 Aorus Ultra

Bios settings: (enabled)
fTPM
CSM
SVM
4G decoding

Settings: (auto)
Resizable BAR
CPU performance boost

Settings: (disabled)
Fast boot

Bios ver F34

Alvast bedankt.

2

This is just something I observed when I enabled RBAR is that it wants to disable CSM so maybe it needs to be disabled?

3

Alright, I’ll try that.

Well disabling CSM disables all of my boot options.

4

Can you check whether your Windows is installed in UEFI or Legacy mode?

You can check this with the following steps:

  • open “System Information” by typing msinfo32.exe in a run prompt (windows key + R) and pressing enter.
  • Check whether the “BIOS Mode” field says “Legacy” or UEFI

A guide with screenshots can be found here: Check if Your Computer Uses UEFI or BIOS [in Linux & Windows] (itsfoss.com)

If your Windows is installed in Legacy mode you cannot boot anymore after disabling CSM. I remember it being possible to change your installation type from Legacy to UEFI so some googling might help you there.

Disclaimer: I am not sure whether disabling CSM wiill fix your RBAR issue

5

It says Legacy, what I was suspecting.

I’ll try to change it to UEFI but I think I might be better off going Revi OS at the same time so just getting a backup drive and then wiping my C:\ and installing Revi on it.

6

UEFI only is mandatory for Resizable BAR, as the “Above 4G decoding” only really properly works with UEFI only and CSM disabled.

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