Even if this helps one person then it was worth it :)
Disable SLI, no more crashes(yes it is very annoying as I was triple screening my PC,and single screening NMS) , all my screen shortcuts have messed up and other games I have had to go back to single screening(annoying again)

TL;DR
Disable SLI

How does one disable SLI?

I thought NMS needed SLI?

Use Nvidia control panel--->>> Configure SLI,Surround,PhysX--->>> Disable SLI
Less than 10% of us(a total guess) use SLI or even have 2 GCards, so that is why the game wasn't also done with SLI in mind as there are lots of SLI bugs still in it(when it runs). Eventually they will get to SLI and fixing it for us, the minority(not a complaint)

My SLI bugs are :
Immediate CTD on startup or Crash soon after game starts
Flickering of starfield startup screen
WSOD(white screen of death)
Stuttering
Random crashes


Now(after disabling SLI) : No problems at all

Ok, tell a lie, when I had SLI I could minimise with Alt-Tab, now I can't as the game won't come back.