Two graphics cards setup: RX 7900 XTX and RX 550 (Lexa)

[Olecko]

Hello.
I have two cards and I want them in my comp )))
1 card is for Windows - Gigabyte RX 7900 XTX
2 card is for macOS - Dell RX550 ID 1002-699F

And I need help with those cards in my hack. I don't know where to start.
I think there is a way to block the main card and let the second card be "main" for macOS. All this stuff may apply DSDT or SSDT.
What info do I need to do this?

 

[Olecko]

Ok.
I managed to get my new RX550 in "main" PCI slot.

To do this, you need to add a device property:


As I understand correctly the situation. I need the PCI address of RX550 from the third PCI slot (at the bottom of my mobo). Then I need to block or turn off RX7900 for macOS.
Any suggestions on how to do this?

 

[Olecko]

Found this AIDA64 report:
PCI\VEN_1002&DEV_699F&SUBSYS_17121028&REV_C7
PCI bus 9, device 0, function 0
PCI Slot 26 (PCI bus 9, device 0, function 0)

 

[Olecko]

Found the PCI path for RX550 in the bottom slot:
PciRoot(0x0)/Pci(0x1B,0x6)/Pci(0x0,0x0)
So now the property looks like:

<key>PciRoot(0x0)/Pci(0x1B,0x6)/Pci(0x0,0x0)</key>
            <dict>
                <key>device-id</key>
                <data>
                /2cAAA==
                </data>
                <key>model</key>
                <string>AMD Radeon RX 550</string>
                <key>no-gfx-spoof</key>
                <data>
                AQAAAA==
                </data>
            </dict>

 

[Olecko]

It works! Now I have double cards setup. One card for Windows - RX 7900 XTX and another card for macOS - RX 550.
Now it looks like this:


What you need to write into your config.plist:
1 You need to find out all PCI paths of your GPU cards.
Mine were:
PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0) - for RX 7900 XTX
PciRoot(0x0)/Pci(0x1B,0x6)/Pci(0x0,0x0) - for RX 550
Gfxutil and Dortania help you.
After that, you need to add some properties to your config. In my case, I need to disable RX 7900 XTX for macOS and enable RX 550.
Disabling RX 7900 XTX:

<key>PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)</key>
            <dict>
                <key>disable-gpu</key>
                <true/>
            </dict>

Enabling RX 550:

<key>PciRoot(0x0)/Pci(0x1B,0x6)/Pci(0x0,0x0)</key>
            <dict>
                <key>device-id</key>
                <data>
                /2cAAA==
                </data>
                <key>model</key>
                <string>AMD Radeon RX 550</string>
                <key>no-gfx-spoof</key>
                <data>
                AQAAAA==
                </data>
            </dict>

 

[Olecko]

Some pictures...

 

[EliteMacx86]

Some pictures...
View attachment 5732View attachment 5733View attachment 5734View attachment 5735

If the GPU gets disabled, it doesn't appear in About This Mac>Graphics/Displays.

 

[Olecko]

Is there any other way to disable GPU in macOS and (or) Windows?

 

[EliteMacx86]

Is there any other way to disable GPU in macOS and (or) Windows?

A guide already exists.

 

[Olecko]

I think that's better ))) The second card was disabled by SSDT. See in attach. But you must enter your PCI path!

How I can totally disable RX550 in Windows 11 Pro?