tumpang thread + identical question

I managed to isolate the BCLK, multiplier and Vcore. So now I'm heading towards the RAM section.

Current progress

BCLK = 200MHz
CPU multiplier = 19
Turbo Boost disabled
EIST disabled
C1E disabled
DRAM timings = AUTO (9-9-9-24)
DRAM ratio = 4
QPI ratio = Auto
Load Line Calibration disabled
CPU voltage = 1.376V
DRAM voltage = 1.565V ----------------------> FAILS IBT
CPU VTT = 1.25V --------------------------------> FAILS IBT
CPU PLL voltage = Auto
PCH voltage = AUTO (1.05V)

So now I'm stuck at isolating the above pointed out bold...do you have any method to quickly isolate these? Currently I'm slowly increasing the DRAM Voltage 1 step at a time...

Any clues?

Oh my thread is @ HERE