That's not a 650w psu, or anything close. Anything with a 4pin EPS is under @ 400w at best. As a comparison, my 520w Seasonic M12-II had 8pin eps, 6pin pcie, 6+2pin pcie and a solid 480w 12v output on 40A rail. The Zeus unit has 2x rails rated at 24A, for a combined amperage of @ 40A. (if it's lucky, which it almost certainly isn't.
View: https://m.youtube.com/watch?v=f6snWfd1v7M
This is the same classification psu as yours, look at rated wattage vs failing wattage.
GTX970 can use @ 170w, regardless of actual listed TDP. Puts your pc in the 320w-340w range maxed out, with gaming loads closer to 250w-260w.
In a nutshell, keep a fire extinguisher handy, that's how bad the store ripped you off, selling something represented as decent because it's '650w'.