In my experience, PNY memory is overpriced and not that great. If you are running it at any timing faster than the defaults----which are typically the lowest ones---then the stuff tends to barf on you. I had one stick that wouldn't even work---it would be as if the stick wasn't even there---if I upped the CAS from 3 to 2. PNY memory is bascially crap from my exprience, so suggest getting a refund if you can and purchasing something else.

I would try to replace one part at a time.

65*C may be fine, but I think that's too high. If it's dropped to about 55*C, then that's safe----if that's where it's peaking at.

That power supply you have now is fine, so I'd start looking at other hardware. Memory---get a different brand, like Crucial or Samsung.
CPU---I suggest getting a different cooler, preferrably one with a copper base.

Basically, what I'm trying to do here is eliminate possible culprits, which has been done with the Power supply. If you really want to you can get something more powerful, but that doesn't seem like the issue here.

I think it's either cooling, memory or the motherboard.