I care.. because I need 1.61v for stabilize 3D06/Vantage on 5300mhz and on M4E I could run it on 1.585v and 5400mhz. Maybe I can run lower freq because of heat (10°C difference now and then) but it doesn't explane the 0.03v difference on 100MHz lower clock. The max OC is almost the same but the stability is far away from M4Es.