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Some reason Neverwinter plays for a few mins, but then totally crashes my PC and powering it off.
I dont know whats going on.
Stress, or you're over your power supplies output.
But Neverwinter is almost as HORRENDOUS with its optimization as Marvel Heroes. But in Neverwinter's case it's murder to your CPU to pretty ridiculous levels.
Was even some tests by tomshardware and the like showcasing that your CPU has to be a late generation i5/i7 to get good frames without minimum settings. Even then it still taxes your CPU so much it's a bit absurd considering the game is action paced...
Do you get any screen tearing or graphical artifacts before it freezes?
It's likely an over-heating issue. Although whether GPU or CPU it's hard to tell.