I followed the tip of @VonSpaky and disabled the HD Audiocontroller in BIOS. Doesn't effect my USB Headset. Since then i had no new crashes. Not even On Ballroom or Grappa. Needs further testing (View Post)
I'll test it Needs more testing but until now no crash. But it may be luck. I'll test it more. I don't know why an audio-chip should produce graphic card related issues. (View Post)