thankyou for assisting me, Will defintely try that OFS pin.
afaik, older Pentium 4 with 130nm/90nm transistor havent got Dynamic VID features, the voltage & frequency are always constant.
what i forgot is, when I cover some VID pins, i don't ground them to make a "0" logic, I leave it open. Maybe the MB pulled up these pins to HIGH state as the intel rules if CPU is removed, it should make a logic VID[0:7] 11111111 [yes there's 8bit on my board, but only 6bit used in P4] and the VRM disabled.
[EDIT: the ISL6336 does indeed do the pullup to logic "1" if the pins left open]
Will pencil mod do?