I'm using Ubuntu, but I'm a novice when it comes to Linux. I'd prefer to stay with Ubuntu, but my lack of experience has caused a few problems. I recently set up a rig that uses the ASRock mobo with a 13 GPU capacity; however, when I put in more than 6 cards I lose the GUI and I have to go into a CLI by holding down the shift key on booting. Is there anyway around this problem? If not, I guess I'll have to try Windows.