Z68MX-UD2H-B3 and i72600k

[magnosantos]

Since i'm a noob i post here some doubts with my setup.

1. Is it normal that if i change the Core Ratio multiplier i can no longer set different multipliers per core on Turbo Mode?
My idea would be to have a base 4.2Ghz OC and on HyperThreading/Turbo boost it up a little more.
2. Why do i see on all the threads people discussing the VCore as 1.2 ou something when my MoBo in Auto delivers 1.35V?
I have confirmed that the the CPU is indeed 2600K.
3. Is below 70ºC a good temp (after Prime95) for a 24/7 OC?

Thanks.

 

[magnosantos]

To add more info:
I don't know why but my CPU don't go beyond 4.3GHz of overlock. If i set multiplier 45 or 48, when o boot the Mobo says it's running at 4.3Ghz (43 x 100). Do i need to change something else to go beyond 4.3?