Hi Speaker,
To answer your questions here goes.
1. Power supply is a Corsair CX 750 W
2. CPU Intel Core i5-4670K
3. Not over clocking cpu
4. GPU came factory over clocked it's a Evga SSC GTX 970
5. When it crashes I mean it reboots my computer, no BSOD or pop up of any kind
6. I have not tried down clocking my GPU