Question 9070 XT - 2x HDMI high refresh displays (144 and 120 Hz) not working

[King Mustard]

ASRock B650M Pro RS
AMD Ryzen 7 7800X3D
32 GB DDR5-6000
Corsair RM850x (2018) 850W PSU (manual)

I have just bought an RX 9070 XT, which will replace my RTX 3080.

I used the same PSU cable that I used with the RTX 3080 (page 6 of the manual, labelled 'PCIe 8 pin (6+2) cable').

I used Safe Mode and DDU to remove the NVIDIA drivers, and also used Safe Mode to install the latest Adrenalin v25.3.1 drivers.

I have a primary LG C4 (HDMI only) (144 Hz) and a secondary LG C2 (HDMI only) (120 Hz).

The RTX 3080 only had 1x HDMI port, so I used an active DP-HDMI adapter with the LC C2 and it all worked fine (144 Hz on the LG C4 and 120 Hz on the LG C2).

My new RX 9070 XT has 2x HDMI ports, so I was hoping to skip needing the DP-HDMI adapter.

When I connect the LG C4 on its own, it detects 144 Hz in Windows and I can play games with no problems - they run as exactly as they should (i.e. far quicker than the RTX 3080 did).

As soon as I connect the LC C2 (via HDMI), AMD's drivers say there are driver hangs (or something to that effect) and within a few seconds, the system locks up.

If I try to connect the LC C2 via DP (via that adapter), Windows detects it and I can use it a second display - but Windows is now detecting it only as having a max of 60 Hz (instead of 120 Hz that the display is capable of). When I try to force 120 Hz, I just get a black screen on the LG C2.

I am starting to already regret leaving NVIDIA.

Can anyone please assist?

 

[Lutfij]

What AIB card did you pick for the RX 9070 XT?

I used Safe Mode and DDU to remove the NVIDIA drivers, and also used Safe Mode to install the latest Adrenalin v25.3.1 drivers.
You're advised to run DDU in Safe Mode to remove all GPU drivers(Intel, AMD and Nvidia) then manually install the latest driver sourced from AMD's support site in an elevated command, i.e, Right click installer>Run as Administrator.

ASRock B650M Pro RS
Em, what BIOS version are you on?

What OS are you on? Age of the PSU?

 

[King Mustard]

What AIB card did you pick for the RX 9070 XT?

I used Safe Mode and DDU to remove the NVIDIA drivers, and also used Safe Mode to install the latest Adrenalin v25.3.1 drivers.
You're advised to run DDU in Safe Mode to remove all GPU drivers(Intel, AMD and Nvidia) then manually install the latest driver sourced from AMD's support site in an elevated command, i.e, Right click installer>Run as Administrator.

ASRock B650M Pro RS
Em, what BIOS version are you on?

What OS are you on? Age of the PSU?

It is the Sapphire Pulse.

Everything worked 45 minutes with the RTX 3080, so it is definitely not related to the UEFI (which is the latest, from a few weeks ago), OS (Windows 11), age of the PSU (a year or two old) nor the HDMI-DP active adapter (link).

 

[sonofjesse]

I always had issue with high refresh monitors and AMD cards. Normal monitors worked fine. I have swore off AMD due to the reasons. NVIDA for me just always always works. 9070XT is a great card if it works for you and great price at msrp. Hope you get it to work.

These look to be TV's cause every monitor should have DP. Be sure your HDMI cables are good and current spec.