I know based on fabrication they underwent. Lower the operating voltage better the RAM generally. But for a layman, this all is redundant. We primarily see 1.65V and 1.5V RAMs in market. How does these work when interchanged with each other's slots? Will a 1.5V RAM work optimally when pushed into a DIMM slot feeding 1.65V to it? Will it OC automatically? How does a 1.65V RAM respond in a DIMM slot feeding 1.5V to it? Does it underclocks? Or it just starts BSOD'ing under stress? Or runs sub optimally?