I don't think power should be your concern. Under load you can't escape this and with speedstep the difference will be negligible. m2 ssd is hit and miss. you really need to be sure that the m2 onboard is pcie 4x or you won't get the bonus. I recently built a couple of E5-1270v3 rigs on recently released Asus P10S-WS boards. They're incredible performers for the money with a shitload of features. The part I overlooked was the onboard M2's are only 1x so 950's etc.. running at less then half rate. For my work (similar use) I have a 2670 on x79 with m2's in pcie adaptors running at full speed. it's awesome. then for gaming I have an i5 rig. The 2670's still do really well in gaming, I just prefer to keep the two uses separate... If you don't need (.. or more want) ecc support I would just get the cheapest x99 setup you can find and be done with it. you should cover all of your requirements this way. for the m2 just buy a $20 adapter unless you really need 3 or 4 slots for other items such as crossfire / 10ge nics etc..