Well 2.95 may be too high for that cpu/mobo/ramset
I saw 1.5v on the CPU-Z shot- that may be too much for THAT chip, I don't know how accurate that temp of 57 is, as i have no idea if Asus has any temp bugs, as i don't own anything Asus.

Did you try and run just 2 sticks of ram?

At what speed WILL it pass Prime?

Your saying "Fails at even just a little OC'

What kind of PSU?
Are the rails stable?
Cpu HSF?
Something is obviously failing, and it's difficult for me to tell what it is, it could be just a crappy clocker.
I would figure out what speed it IS stable at, with decent temps @ stock vcore, and then go up from there.