Pc keeps crashing had psu tested its ok need more help finding the problem

I think it's very likely. I'm assuming this was a CyberpowerPC or iBuypowerPC build, or that you bought the PSU from one of those companies? Either way, it's very likely to be the problem, even if it isn't the only possibility. PSU testing generally won't determine whether it's holding up under loads, or extended loads, only that it's meeting spec at idle, unless it's tested on expensive equipment which isn't usually what get's done at most mom and pop shops.

Like I said before though, I'd attempt the clean driver install procedure using the DDU first. It could also simply be a system configuration problem or a result of an older driver on something else. A clean install of the OS is often a good place to start as well. Very hard to make any serious guess without having a known good power supply of reliable quality installed.