Im Running a Asus P5N-D With a Q6600.  I have been told to overclock the board with the following information.
 
FSB - 1333
Ram - 850
Unlinked
VCore - 1.4
Dram - 2.1
HT - 1.4
NB - 1.4
SB - 1.5
 
These Settings are not right.  They Worked but it glitches my computer up after a while.  Lets say Im watching a AVI while downloading stuff at 900KBPS all of a sudden the avi I am watching will totally glitch and turn a 1000 different colors with lines running through it. But the background desktop will be ok... But when I got to shutdown the whole computer crashes.  Whats wrong with these Settings????  
 
I have recently Set the HT to 1.3 instead of 1.4, and I set the NB to 1.38, Kept the SB the same.  Now my CPU temp is 47C and my MB is 41C. - while downloading stuff on azureus and watching a avi. (My motherboard would hit up to 45C when I had the HT at 1.4)  Is this right? Can someone please give me correct voltages for my P5N-D Motherboard....

First of all what RAM do you have and why are you running it at that speed?

The Q6600 is a FSB1066 CPU which at stock runs 1:1 with DDR2 533.  At FSB 1333 in order to run 1:1 you would only need DDR2 667 and if your using DDR2 800 you could either underclock it and tighten the timings or run it at it's stock speed.

Take these voltages as only suggestions and not a guide line. Overclocking through bios is a trial and error process, so start with an overclock of 300mhz on the frontside bus with stock voltage and run a stress test. If you remain stable continue uping the fsb until you fail a stbility test or blue screen; then bumb the Vcore by .01 of a volt (if permited by mobo) until you are stable. Continue this process until you reach your desired overclock. I wouldnt touch your northbridge or southbridge voltages just yet; I would only touch them if you cant stay stable with a high vcore (past 1.5v on vcore is not safe for the q6600 unless you are on water or extreme cooling). Get the latest copy of prime95 beta to put your quad to real work when stress testing.

I think the reason why is because im overclocking with not proper cooling.. I just purchased a Cooler Master 690 Case with a OCZ Vendetta 2 CPU Cooler.. My q6600 is a G0, and the ram is OCZ Sli Edition 6400 (4-4-4-1T 800MHZ 2.1V stock)
 
Itd be really cool if someone could post some Bios Voltage settings that has worked for them.  I need the settings for HT, NB, and SB.  

(Q6600 User)  
 
Q6600 @ 3,2 ghz 400fsb (8 multiplier)  
vcore 1,33 volts (g0)
Tuniq Tower 120  
Corsair XMS 2 DDR2 800mhz 1:1 standard timings
no voltage screwing further..
 
@ abit ip35 pro motherboard.  
 
or you could go with a safer zone, lets say, to 3ghz without too much hassle i believe at 1,31 vcore voltage.
and it would serve you very well...
 
also take a look at this topic it's huge, but contains good information, which might help you out.
 
http://www.tomshardware.co.uk/foru [...] uals-guide

Alright I took your advice Now my setup is as follows
 
FSB-1600
Ram - 800
3.2 Ghz - 8X Mutliplier
1:1 FSBram - 4,4,4,12,2T
 
Vcore - 1.375V
Dram - 2.1V
HT - 1.3V
NB - 1.38V
SB - 1.5V
 
I havent done any gaming yet But it loaded up azureus and im running at 999KBPS while watching a avi and everything seems to be running smoothly.  Ill test gaming out in a lil bit, I just wanna make sure My avi is not gonna glitch all up..
 
The Vcore on my Asus Probe saids my Vcore is running in between 1.30V - 1.33V  
CPU - 47C
MB - 41C
 
Does anyone know accurate HT, NB, and SB settings for this motherboard wth a overclocked Q6600.. A q6600 at 3.6ghz with correct NB, SB, HT voltage settings would be sweet.

If your RAM is rated for a 1t command rate why do you have yours set to 2t?

The settings I posted didn't work.. I uped my VCore up to 1.4Volts now my Asus Probe saids im at 1.33V.

I never had good luck when I had the Command Rate set to 2T on my previous motherboards.  I just set the Command Rate to 1T, with 4-4-4-12 timings at 800MHZ ram.. And it actually booted up windows xp 64.  Lemme see if this turns out successful.

Soon as I typed that I got a blue screen saying IRQL - Not Less then - Or Equal to.... So I changed my ram settings to 4-4-4-15-1T - the way the factory made it. If I get another blue screen Im changing it to 5-5-5-15-1T.  And if that fails im putten it back to 2T.

http://www.ultimatebootcd.com/
 
Download and burn this then boot to the CD.  Run memtest with the memory set at it's recommended settings.  If you don't get any errors then the memory isn't your problem.  There are quite a few tests on the disk to help you narrow down the issue.

Do you really think the ram could be the problem that the graphics glitch up when watching a avi? I mean is it possible? Or is that something to do with the Motherboard overheating or something..  I dont have a good cooling PC right now, its a cheap computer case and a Zalman Genti II cpu cooler.. That thing sucks. Im getting a cooler master 690 case and a ocz vendetta 2 cpu cooler in a couple days.  Also did you want me to grab the Memtest86 or Memtest86+

Alright, I set everything back to automatic, Im waiten till I get my new case and cpu cooler before I do anything else.  Could you give me a rough estimate of where my HT, NB, and SB should be though at a overclock of lets say 3.6 or 3.4 ghz

yo aiite - with my regular cooling supplies without all my new stuff this has been extremely stable for me.  Has not failed on me once.
 
1333FSB - 800Ram (Unlinked 4-4-4-15-2T)
Vcore - 1.375V
Dram - 2.11V
HT - 1.28V
NB - 1.32V
SB - 1.50V
 
What do I have to do to make 1600FSB - 3.6ghz Stable...

Just an FYI you may be experiencing this problem:
 
http://forums.nvidia.com/index.php?showtopic=65855
 
It's a problem only with Nvidia 700 series chipset.
 
Here is a youtube of the actual bug, at the 1min mark:
http://www.youtube.com/watch?v=TYHuzJSpORw

wow man thats totally it.... how do i get rid of it.. i havent read the forums yet, im about to lol.. if you know anything let me know man.

Sorry, don't know any resolution. I have a Asus P5N-D 750i and 8800Ultra but have never experienced this.

hmmm, you say you had a 8800ultra and never experienced it..  I have a 8800GTS G92.. but its a pci express 2.0 maybe the problem has to do with pci express 2.0 i dunno man. It doesnt happen when I dont overclock, only when i do overclock.

I just got my new cooling supplies and I hooked everything up.  
Im at 3.6ghz I ran 4mins through a avi (the simpsons) Still runnen.  My cpu is at 41C and my MB is at 40C.  I havent overclocked my graphics card, but the fan speed is on 70percent.  I hope to god It doesnt glitch up. Ill keep you updated.

17mins, im downloading 3dmark06 on my new harddrive, gonna run it... then play a different avi.

crashed.... reloaded windows played the same avi that glitched... and get this man.. It crashed at the same EXACT molment that it crashed last night. I mean in the avi.  It has something to do with the stream of the avi through pci express 2.0 or something. Its weird man.

I don't watch nearly enough videos as you, thats probably why I haven't experienced it. So far the only video I"ve watched are Stargate SG1 DVDs, using the Media Player 11 with Vista64 ultimate.
 
My setup:
 
E8200 OC - 3200ghz - cooling with Thermalright Ultima 90
P5N-D with latest BIOS
EVGA 8800ultra stock speeds
Patriot Viper DDR2 800 4Gig - (2x2gig modules) at 800mhz unlinked mode
Windows Vista64 Ultimate