My G.Skil ram is DDR3-1600 , PC3- 12800. I have not manually set the RAM speed or timings or voltage at all, Nor have I ran memtest.
however, I do plan on running memtest over night.
My PSU is a Corsair TX850W, should be good enough for it.
edit: im using all default bios settings just like my friend who has the same exact computer as me, and it never freezes for him