Unless I sound crazy, wouldnt the smarter choice be to find the max of your RAM and CPU, and then add them up and find the sweet spot and play with the voltage until you hit that sweet spot?
^listen to that method
really it's just trial and error of both CPU and RAM speed and finding the fastest "efficent" combination. basically lowering CPU multi and testing how high your RAM goes and then trying some memory divider speeds to find the CPU ceiling
and then pretty much find what works best together. for example with me my RAM maxes out at about 317MHz but my core will go higher than 317x9 BUT I can't use 180 or 166 dividers because my memory controller sucks, and I would rather have 313x9 1:1 over 333x9 with RAM at like 270mhz