The pci-e settings have nothing to do with the board or cpu oc, I use those for my vid oc's. As far as actually explaining voltages like dimm mem ref, that's a litle out of my league but I was always taught (through forums like this) that a good setting for that value is 50% of vdimm. I have no idea if it helps me stabilize but it doesn't hurt All my settings are settled on after experimenting with my own various setups after periods of trial and error and are examples for reference only. I would not recommend any of it for anyone else but I do recommend patience and experimenting. I have killed a lot of gear so take anything I post with an x-large grain of whatever.