My memory is garbo, lest ye forget... and my 520W BIOS got overwritten somehow, I don't understand how. I put it on the OC switch position before flashing & now both are behaving the same way (memory locked at maximum speed) Grrrrrr...
Gotta find a copy of the 520W ReBar BIOS again now. Stupid NVFlash.
Edit: For anyone else that messes up their BIOSes doing such things, Jacob posted the ReBar BIOS for all 3 switch positions here:
https://forums.evga.com/FindPost/3248910