Kannst ja meine Werte von oben mal testen. Wobei Chris recht hat. Jede Vega ist anders. Also Backup EFI stick in Reserve halten.
Bzw. hier der Eintrag aus der OC config.plist:
<key>PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)</key>
<dict>
<key>AAPL,slot-name</key>
<string>Internal@0,1,0/0,0/0,0/0,0</string>
<key>device_type</key>
<string>VGA compatible controller</string>
<key>model</key>
<string>Radeon RX Vega 56</string>
<key>PP_PhmSoftPowerPlayTable</key>
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</dict>