RX 6900 XT Founder ed. not working properly

zzmadd said:

Thanks for your reply!

- Yes, it is an AMD Founders Edition card. No third party.
- CSM is turned OFF in the Bios.
- Nothing is connected to the motherboard video port.
- The system is slightly overclocked, it's an i9 9900K
- I will try with Ventura on a different disk

Thanks a lot!
ZZ

Click to expand...

SmackAttack said:

Didn’t you say the system is a 590 with a 10850k? Or am I just confused (likely).

Def sort out getting VTD properly configured, def make sure you are using SMBIOS iMacPro1,1, def make sure you have no device properties set for the GPU (if sticking with 1,1 SMBIOS). Then, if you’re sure those are all correct, remove your overclock and try again.

You can post your clean efi for us to look at, but first maybe clarify your components.

J

Click to expand...

etorix said:

You only need to inject a custom DMAR if the default one has reserved regions. Note that a custom DMAR will likely break things with Windows.

Click to expand...