So I had a 750ti and upgraded to r9 380 but my cx430m was not powerful enough to power the r9 380 so I got the aerocool 750 psu put the new psu and gpu in but it isn't posting to the monitor but the gpu posted with my old psu but tried it with both psus today and it will not post please help
OK so what about other games????
You say fallout is crashing, do other game crash it? What is your resolution and settings? Have you tried setting to lowest settings and see if it's stable and work your way up from there?
Lots of questions, can you try what we've suggested and post back? i'd really like to help you out but i need more info.......