Weird 865G Neo2 PLS OC Problem

Question

Ok, I consider myself a pretty good overclocker, but this has confused me to no end. Ok here is the situation. I got a neo 2 pls 865, with a p4 3.0 E prescott. I have 3 sets of ram I have been using to get an overclock, 1 512 kingston value ram, 4 256 Vdata, and dual channel kingson hyper X (performance ram) all PC 3200. I know the kingson hyper X can overclock pretty far from my AMD 64 overclocks.
Ok so I got this 3.0 at fsb at 225 for a 3375 clock witch is OK, but Im sure I should be able to go further. Oh and that is with the mem at 333, so memory is running 391, still way under stock. And just to let you know it runs fine stock with memory running at 400.
Ok so I turn up the fsb a little more like 231 ta 235 and I get tons of errors on memtest. So I clock the ddr clock to 266, (so the memory is running at like 312) and it still errors at around 67% of memtest. That was all with the kingston valuel ram and vdata stuff. So I put my kingston hyper X that I was thinking was going to run fine, but still SAME EXACT PROBLEM. :0(
Sorry for the long post, got any help? Need more data? CPU and RAM voltage are stock.
THANKS FOR ALL HELP.

Answer 1

The MoBo model/version is printed between the PCI slots.
Important thing is to separate the "old" 865 Neo2 from the "new" 865 Neo2 P-series.
According to your description - 865G Neo2 PLS - you´ve got the newer P-serie MoBo and you should use the 3.x biosversions.
http://www.msi.com.tw/program/support/bios/bos/spt_bos_detail.php?UID=557&kind=1
I believe 3.8 and 3.A are considered to be the best versions.
Don´t get fooled by the 3.31a figures - this is the biosflashprogram version and not the actual MoBo bios version.
The warning text about "cannot be used on the 865PE/G Neo2" - is related to the old 865 series.
I see no need for you to go below 333mhz RAM speed, that should be enough up to a 250FSb OC.
If you have trouble with that, the reason would be something else.
To get best RAM performance you should run 2x512 ( or 4x256) RAM, in dual channel mode.
You may need to raise your RAM voltage to 2.7v ( as dcasole already suggested) and be sure that AGP/PCI is locked to 66/33.
It is possible that the onboard Graphics could limit your OC ponetial as well - Tried with AGP Graphiccard ?
You also may have to raise the cpu voltage in the end, but be a bit carful with the prescott since it got it own flexibel voltage/ thermal control. No more then 1.5v. - Also recommend a good cpu cooler and good case airflow.
You should be able to reach 3,6Ghz (240FSB) if your cpu has a "normal" potential.
Your PSU is too weak on the 12v line - we usually recommmend 20amps or above with a prescott cpu and OC.
Even more if you would get a high end VGA card.