Grey monitor w/ OpenCL and glitchy/out of GPU Memory w/ CUDA

Hi all,
I am wanting to bite the bullet and purchase Resolve after watching Youtube vids on usage. It's a clear leader and a fair price. Nice.
I am testing though first on the free version to see it works.
My signate has my hardware. I am running the GPU on an eGPU case via thunderbird and it works a treat everywhere in the OS. Games, etc etc. Davinci loads, can see it and auto selects it etc.
However, after converting footage to something readable for resolve (doesn't like mp4 it turns out), I get out of GPU memory warnings and glitch video in the monitor window that I can't even see or use if on CUDA and I get blank monitor window on OPENCL.
Is there anything I can try? I'm dead keen to get this going. As I say, happy to purchase, but only if I can get it working of course. Any help or advice would be greatly appreciated. Thank you
UPDATE: I've tried with DR 16 and 17 and identical behavior, except with DR16 the CUDA works with audio now, and just a black monitor (no glitching)
I am wanting to bite the bullet and purchase Resolve after watching Youtube vids on usage. It's a clear leader and a fair price. Nice.
I am testing though first on the free version to see it works.
My signate has my hardware. I am running the GPU on an eGPU case via thunderbird and it works a treat everywhere in the OS. Games, etc etc. Davinci loads, can see it and auto selects it etc.
However, after converting footage to something readable for resolve (doesn't like mp4 it turns out), I get out of GPU memory warnings and glitch video in the monitor window that I can't even see or use if on CUDA and I get blank monitor window on OPENCL.
Is there anything I can try? I'm dead keen to get this going. As I say, happy to purchase, but only if I can get it working of course. Any help or advice would be greatly appreciated. Thank you
UPDATE: I've tried with DR 16 and 17 and identical behavior, except with DR16 the CUDA works with audio now, and just a black monitor (no glitching)