Quote Originally Posted by linbetwin View Post
Hello XS-ers,

This is my first post here and I have a bit of an issue with this board.

P5Q-Dlx BIOS 1201
Q9550
Corsair 2x2 GB @ 800 CL4
Powercolor HD 4870
2x WD 6400AAKS in RAID0 on ICH10R

The problem is that the system is not stable at stock freqs. I have to go to 8.5x400 and DDR-800 to find rock-solid stability in IntelBurnTest, OCCT, Everest, etc. It doesn't seem to be voltage-related, because I am at 3.4 GHz with 1.13... vcore and 1.10 vNB, less than what Auto sets. I suspected the board is only stable at 1:1 ratio, but it's not stable at 333 an DRAM-667. Tried all the straps but that doesn't seem to make any difference. What do you think might be the problem ?
You're definitely in need of higher vNB, as you are running a quad and 2 x 2GB ram. Try raising it to 1.26v and re-test. Try vPLL = 1.52v, vFSB = 1.12v, vcore = 1.20v also, I think 1.13v may be too low for vcore at 3.4GHz. After you get the whole system stable you can start lowering vcore anyway and find out what it needs.