[Ben Wright]

Have had the same issue. Built an AMD pc with the 3900x cpu and the 5700xt gpu. Finally reached out to black magic about the issue and got this response today:

“Hello,

Doing some research online, it does not seem that 5700XT is a good choice for Resolve as it seems to thermally struggle in some situations under a load, compared to other current GPUs.
As the GPU used for almost all of the operations in Resolve, it may explain the behavior you are observing.
I suppose you can try exploring different versions of AMD drivers to see if you will get different results.
You can also see if unloading some of the decoding operations of the GPU would help (options in the Resolve▸Preferences…▸System▸ Decode Options)

We are not able to qualify custom build systems or diagnose their performance issues.”

Sucks because my PC has the latest hardware from AMD but is slow as freak while running Davinci Resolve. My guess is that the drivers are the actual issue seeing as the 5700xt is neck and neck with the nvidia 2070 super in almost all tests.