Black screen crashes during gaming. CPB off or fixed frequency solves it

[Shodan0000]

I have been playing the newly released Oblivion Remastered for some time, but in the open world I have frequent crashes.
When the game crashes, it gives a black screen, monitor signal lost, USB devices are also off, computer fans stay on. Only a reset helps.

My specs are:

• GPU: 6900XT
• CPU: 5800X
• MEM: 2 * 16 GB Kingston HyperX Predator 3600MHz
• Motherboard: MSI b450 Gaming Pro Carbon AC
• Windows 10

What I tried to remedy the issue:

• Install latest AMD driver (using DDU in safe mode to uninstall previous driver)
• Update BIOS to latest version
• Disable XMP profile
• Undervolt GPU (For some time, this seemed to give greater stability, but the above mentioned save file still crashes it
• Underpower GPU (-10% power)
• Turn off all AMD functions in Adrenalin
• Turn off CPU settings: Core Performance Boost / Precision Boost Overdrive

Only the last one solves the crashes. Turning off only PBO still gives crashes.
I then tried running the PBO settings in ECO mode, but then crashes still happen.
When stress testing the CPU / GPU in OCCT, nothing happens (on standard bios settings).
Currently Oblivion Remastered is the only game that gives this specific crash, but the fact that it can be solved by turning off core performance boost does seem to me that it is still a hardware related fault.
Obviously turning off CPB is not a real solution, since it makes the CPU significantly underperfom. So I tried setting a fixed multiplier (41 43 44.5) all work without crashes. So for now, this is a good workaround I think, but I believe there may be better options to try.

Any suggestions are welcome.