Uncore 4200mhz on bloomfield and 12gb will require _very_ high qpi voltage. 1.55v+.

For 4000mhz uncore on all 6 of my bloomfields, with my 12gb 9-10-9-27-1T 2000mhz mushkin kit, I needed 1.4875v QPI.

1.41v core also seems low for 4.4ghz on bloomfield.

NB voltage doesn't do much... you won't need more than 1.2v.