Asking for voltages will really do you no good at all. I have 4 980X and 970's running 2 of each + 1 920. The voltages vary no 2 are the same I have 1 that takes 1.36v to run 4.3Ghz 1 takes 1.33v, 1 takes 1.42v and 1 will not run at 4.3 no matter how many volts I give it. There are allot of things that are important when it come to OCing a 1366 look around at the different folders out there running them.
Just for instance when stern first posted his 980X OC and frame times he was achieving a higher OC than I was, but his frame times were quite a bit slower than mine. I gave him a few tips most of which he did not believe,
due to the things other people have said about the 1366 CPU's. Such as memory speed and timings does not matter, those quick and easy OC guides etc.
stern decided to test what I was telling him rather than just dismiss it and discovered that there is more to these 1366 CPU's than what most people realize.
They are pretty easy to OC but they are not that easy to get the OC right. If you OC a 980X correctly at 4.2Ghz that 4.2Ghz OC will out fold 90% of the people that are OCed to 4.4 or 4.5. It takes time and patients to properly OC a 1366 CPU. Your most important settings are going to be Vcore Voltage, Ram QPI Voltage, and you will have to find the best balance between them. The correct BCLK Multiplier and odd or even does not seem to make a difference it depends on the cpu. And the QPI multiplier. Do not stop at your highest Ghz settings they may not be your best performance setting. All of mine actually preform best a less than there highest folding stable OC.