Dreadful case using e-GPU in Resolve

I just purchased an external 1070 e-GPU (Gigabyte Aorus) to properly work in Resolve on my Notebook.

To my surprise it works awfully just unusable. H264 24 fps clip is played back quite fine on my internal 1050 card, but 1070.. shows around 16 fps average! What the hell is going on? I actually have both GPUs enabled, I tried to use 1070 only - same result, but if use 1050 only - it works just fine.

Windows 10
Resolve 15.1 Studio
16GB RAM
7700HQ
internal 1050 2gb + 1070 8gb Aorus e-GPU
fast ssd
H264 4k files shoot on GH5

Also my notebook has only 2 lanes thunderbolt port but I doubt that's the problem, should still be much faster than my castrated 2gb 1050. Games run fine btw.

I also tried to playback some GH5 4k60fps files just through the file system - they run perfectly smooth on 1070, and on 1050 they are very choppy. So the GPU defiantly works and it seems to be purely Resolve problem.

or only support for BMD certified hardware ?

or only support for BMD certified hardware ?

That would extremely dumb. And I actually don't understand what is there to support. All e-GPUs have native support on Windows. On Mac its another story but not on PC. It seems like a bug to me, rather than anything else. It should work by all means.

Yes i guess you 're right, and i see you have the Studio version, which should have also optimizations speed wise vs. the free version.

I want to emphasize this one more time - on a default windows player 4k60p files playback like a charm on external 1070. There should be no reason why it shows only 17 fps in Resolve in 4k24p. Please help me solve this. I even tried watching 8k60p on Youtube and it works! There is some lag and stuttering here in there, not perfectly smooth, but its almost there.

Updated Nvidia and TB drivers, and here is my screenshot from Resolve attached, noup that doesnt help

I can disable 1050 and it doesnt effect anything, same as "Auto", only if I choose 1050 manually and disable 1070 completely (or just pull out the plug from it) it works.

Now the interesting thing - I did test the GPU usage and my 1070 shows 70-80% usage when I try to play a simple 4k24p clip in resolve. Which it cannot play smoothly anyway. Now when I playback a 4k60p file in windows directly, I get around 40-50% GPU usage from my 1070. And when I try to playback 4k24p file in Resolve with 1050 only it shows 13% GPU usage for 1050 and 70% usage for Intel HD 630 which I though doesnt participate in any kind of rendering in Resolve at all. Very wired. For 4k60p in Resolve 1050 gets around 30% usage, CPU spikes to 90-100% and intel HD 630 is still around 70% and the fps is around 45fps.  

In windows if I use CUDA player to play video my 1050 can actually handle 4k60p with no problem getting around 35% load and 22% CPU with 60% HD630 load. Wow. I previously was using HD630 trying to play it and it could not, but 1050 does it with only 35 load. So how my 1070 gets 50% load at the same task? Haha)

So bottom line for now - Resolve H264 playback codecs are AWFUL! Am am truly amazed that no one except Apple solved this problem with smooth video playback. And I am amazed it is not a first priority for BM to fix this and be competitive. I guess now I need to buy a Mac and forget about Resolve (there is still not a single answer here from BM representatives). That is sad cos I liked the app and its interface.