Horizons Why is Horizons less optimised for AMD cards than in the beta?

I played all through the horizons beta and really enjoyed planetary landings. I was able to drive the SRV with very good FPS and no glitches on the highest settings. So then I loaded the live version and I'm getting planet terrain corruption and have to lower the settings. Now I'm getting floating rocks and holes in the terrain. I'm not sure what they did between beta and live horizons, but the optimization for (some?) AMD cards took a nose dive with the current version. The only advice from FD so far is update your graphics driver, although the beta version worked fine with my current one. Please revert this back to a playable state.
 
What card do you use?
AMD seem to have issues putting together a decent set of drivers together although FD seem to have issues as well.
 
The point I'm making is in beta all the planetary exploring worked fine and now it doesn't in the live horizons version. So I know it isn't my card or driver, but whatever additional changes were made for the final live version. Looking in the bugs section I can see that other people using AMD cards are having the same problems.
 
I've been using a Radeon 7850 with the 15.7.1 CCC drivers. In basic 32-bit ED I had custom settings with everything set on "High" or "Ultra". This gave me smooth FPS and rendering. With 64-bit Horizons I found terrain popping on planetary approach and noticeable drop in FPS when driving around. I went into the graphics setting and selected the default "High" setting. I also adjusted GPU terrain generation usage by placing the slider to the midpoint. I now have no noticeable FPS drop on the surface and the planet terrain renders smoothly on planetary approach.

Hope this helps to get an idea what AMD cards can do in Horizons.
 
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