F2-6400PHU1-1GBNR Won't post

[Gmiller]

Hi:

I have a new build with an
Asus m4a785-m mobo bios dated March 2010
athlon II x4 635
Win XP sp 3

I have 4 1gb sticks of f2-6400phu1 - 1gbnr ram from 2 computers that I am trying to install into this 1.
When I put all 4 in it won't post. it will recognize all individually but i can only boot and run 2 sticks in dimm a1 + a2 slots. also, they will run in single channel only in this configuration.

What settings do I have to change to make all 4 sticks run together in dual channel mode?


Any help is greatly appreciated.

[GSKILL TECH]

Have you tried A1+B1 slots? Can two sticks work in dual channel? If not, the motherboard may be defective. If no problem, then you may need to raise VDDNB Voltage +0.1V and HT Voltage to 1.30V-1.40V to stabilize four modules.

Thank you
GSKILL TECH

[Gmiller]

Yes I did try, these are the only 2 slots that work.