G.Skill F2-6400PHU2-2GBNR on P5B dlx cant get stable at all.

[Clunker]

Hi,

i have bought some G.Skill F2-6400PHU2-2GBNR, but i cant get them stable in memtest. If i run memtest, i get errors. I have tried them on 2 different P5B systems with no luck.

In the settings posted here
it says 1.8v, but if i try and run mine at 1.8v, they error immediately in memtest. (it also says 1.9v on the sticker on the ram)

I have tried 1:1 E6300 @ 7x400 = ddr800 (i have some corsair that works at this speed so i know the rest of the system is fine), but i get errors after a few minutes in memtest.

I have tried the exact settings that are posted in the above link (266 fsb, ddr-800 for the ram, ram voltage 1.9 (1.8 wont work at all) everything else on that page auto. mem timings 5, 5, 5, 15, 4, 42, 10, 10, 10, 10, auto.

tried the black slots and the yellow slots with similar results.

can anyone help me please?

thanks.

edit:

system details

e6300
p5b deluxe 0706 bios
g.skill NR 2gb
Enermax liberty 620w
7600gt
samsung 400gb