Since overclocking is NOT an exact science our opinions may vary, however I do provide valid evidence to what I suggest in the links I post, and personal experience with a Gigabyte motherboard having a
1366 chipset using a core i7-900 series Bloomfield processor (i7-950 in my case). The OP has a similiar system to mine.
Also I note you have an i5 system so your requirements are different from ours.
BTW I'm only overclocked to 3.5gig and I have to run my QPI to 1.25 just to be prime95 satable. On and I think I said the QPI needs to be somewhere between 1.250 & 1.315
Anyway I say again.... If he's going to clock that high (4gig) those voltages need to be manually set and since he's pushing the limits of the processor those volatage need to be that high.
Yes there's always exceptions to the rule, and we should always try lower volts first for temps sake, but if you start getting BSOD blah blah blah 124 codes - your QPI is too low (reading and personal experience).
Also look at any overlocked i7-900 series chip pushing 4gig and you'll see QPI volts around 1.3.
As for his memory I'll conceed his memory
Corsair XMS3 DDR3 1333MHz 6GB CL9 only recommends 1.5volts -
XMS3 whereas my Corsair memory (TR3X3G1600C8D) -
Dominator® recommends 1.65volts! So yeah, his isn't required to be run as high as mine.
However he still needs to get off the auto voltage everything if he's going near 4gig!!!
My two cents.