Vista - E6850 Oc problem vista 64 bsod when stress test

Am having a hard time trying to get my system stable on vista ultimate 64 on xp pro 32 bit it worked great

am getting the bsod when i run orthos prime 95 and occt
VCORE 1.42V
FSB CORE 1.4V
FSB 1616 @3.636Ghz
Memory 2.1V


I added more virtual memory

Initial size (MB) 4393
Maximum size (MB) 6139

and it seems the bsod stopped but orthos and prime 95 will get errors and stop 3 to 4 hours in instead of bsod in 3 min into it

So far gaming on crysis, cod4, assassins creed, guild wars, call of juarez, ut3, star trek armada 2 and command and conquer tibwars and kanes wraith i have not crashed or locked up

only games i lock up on or crash are bf2142 and bfme2

and droped down the fsb from 1616 to 1600 or 400fsb depends on how you look @ it.

but still with overclock and stock i still get errors any ideas why?

Hm.. well you should be able to hit 3.6 GHz decently easy.. and with less volts than that. I can hit that with my Quad on those volts. I know all chips are different. but you should be able to hit that..

Have you tried loosening the RAM timings.. have you done anything with ram to Rule the RAM out first? changed Divider or something.

I have messed with the times of the ram and up the volts

i have tried

5-5-5-15-2t timings
5-4-4-15-2t timings

i have up the volts of the ram to 2.2V i don't now what other timing to try and sugestions

but i am thinking its ram related

What timings does the mobo set for the RAM in auto mode?

5-5-5-15-2t

right now am running @ 5-4-4-15-2t. am not bsod when i run stress tests

am running 2 dual kits of

OCZ Technology | Products | Memory | OCZ DDR2 PC2-6400 SLI-Ready Edition Dual Channel

there is a 4GB Dual Channel Kit and am running those timing for all four sticks which made it more stable.

OCZ Technology | Products | Memory | OCZ DDR2 PC2-6400 SLI-Ready Edition 4GB Dual Channel

Running dual dual kits may be your problem - the nVidia chipsets (especially the 6xx and 7xx series) have issues with running 4 DIMMs at one time.

thats what i was thinking, my buddy has 780i ftw editionwith the same ram and four gigs and he dosent have any problems

Supposedly the 7xx series is also problematic, however, I remember many more posts about the 6xx than the 7xx. With the 7xx I think including that cheapo fan for the Northbridge helped alleviate *some* of the problems, but there is a 'mobo mod' out there in the eVGA forums about the 780 where you can take a 60mm x 20mm fan and wire tie it to the radiator fins and plug it into the aux fan Power source instead of the NB fan Power source, and it runs a lot faster - seems the mobo limits the juice going through the NB fan power source....

so a 2x2 dual kit would be better then i take it?

Ya thats what people say.. But you can get better timings with the 4x1. but it's easier on the Mobo to have 2x2. Thats what I have.

Also when I said are you messing with the Timings. I didn't mean go lower.
If your having problems getting your OC to be stable. and you are pretty sure you have enough vcore. then try "Loosening" your RAM timings.
I know that ram is rated for 800 MHz at 5-5-5-15. or maybe less cuz it's 800.. prob 5-4-4-12 or something.

But with an OC. I'd try loosening them to like 5-6-6-16 T2 and see if it makes it stable. When you think the ram is the problem. Give the RAM enough Juice. Make sure your runnin what the MFG spec is for the ram at that speed. and then try loosening the RAM. gives it a easier time. for a more stable clock. just what I've been able to do. is loosen them for better results.