Geil 2x1gb PC2-6400 DDR2 and P35-DS3R issue

[sniper007]

Hi guys,

I have a Gigabyte P35-DS3R and I have an issue with my overclock. I am posting in this forum as I think it is my ram that is the issue.

My CPU is a e2140 and I have this completely stable at 3.2ghz. As this CPU has a low multi of x8, I am at a point where I need to find out what my RAM will do as I have a FSB of 400x8 = 3.2ghz. Ram is at 1:1 and hence is running bang on its rated 800mhz.

I have seen people hit 850/900 even 1000mhz with this ram, and everytime I try to boot with the FSB even slightly over 400, I will not be able to boot at all. I have NEVER been able to boot with the FSB over 400. I have even put the multi at x6 so I know the CPU can definitely handle it, and I still cannot boot. Its not like it even gets close either...just won't boot at all.

Heres the wierd thing.... memtest @ 800mhz passes every time absolutely fine with whatever volts or timings I like. 5 5 5 15, 5 5 5 18, 4 4 4 12. Also I am Orthos stable in windows with the RAM at 800mhz all stock at 3.2ghz.

I have tried upping vcore, upping ddr2 voltage to its max rated 2.3v, upping pci-e voltage, upping NB voltage, pci lock at 100/101/102, and have tried relaxing timings.

This is strange...anyone any idea why I cannot go over 400 FSB with this ram? Is it likely to be a Mobo issue with running 400+ FSB or a ram issue? I am sure it is ram, as this board is rock solid at 400 FSB and I have heard of it going up to 500 odd FSB.

Any help much appreciated.

EDIT: I know this board suffers from bad vdrop and vdroop so have even tried to account for this also. Still no joy.

[hstuehmeyer2000]

its the cpu, it has an fsb wall, my old e2140 couldn't boot over 410, now my new one can do 460, its just luck of the draw

[sniper007]

Your dead right it's not the ram. Seems to be a common thing with these CPUs. Oh well...am fairly happy with the result for 40 odd pounds! I just need to get my temps down. Que new thread soon. Cheers