[[1.0][Release-5-0][April 28, 2015] Active Texture Management - Save RAM!]

You can try forcing DirectX 11. That does it on my machine. Unfortunately, Unity doesn't seem to manage the VRAM so it tries to stuff everything in there. Great if you've 4GB of VRAM, not so great if you've only got 1GB. :/

The command line option is -force-d3d11.

Sadly. running the game with the -force-d3d11 flag causes even more visual glitches than OGL. And yes, the game manages to flood all of my 3GB of VRAM and then almost clog up the system RAM too.

The visual glitches can be averted by using -force-d3d11-no-singlethreaded instead but that causes the game to not utilize VRAM again (why would that ever happen? I'm at a bit of a loss here).

Not to mention DX11 cuts severely into the framerate.

[[1.0][Release-5-0][April 28, 2015] Active Texture Management - Save RAM!]

Say, is there any way to make make KSP use VRAM under DirectX?

The game seems to consistently crash with empty VRAM regardless of what the make_not_readable flag is set to.

With OpenGL forced the game actually uses VRAM like it should but that comes with it's own baggage of issues like no shadows, etc.