Motherboard voltages when overclocking Q9650

Michaeljcox24 · 8 Mar 2011 at 20:53

Can anybody give me any pointers as to what voltages in the bios I should be upping (and to what levels) to achieve 4GHz stability on a Q9650?

Currently at 1.35v, FSB 447 and small FFT freezes after 25 mins or so on prime.

With my old Q6600, I never had to change any of the board voltages, so I'm not sure which ones to increase and by how much.

setter · 8 Mar 2011 at 21:30

The voltages you need to be changing are.

pll
fsb termination
nb

The max reccomended for each are.

pll, 1.6v
fsb term, 1.4
nb, 1.4

Iirc, with my q9550 @3.8ghz on a p5q deluxe i was running 1.54 on pll, 1.26 on both fsb term and nb.

Michaeljcox24 · 8 Mar 2011 at 21:38

ok, thats a starter. I'll try those settings. Cheers.

Michaeljcox24 · 8 Mar 2011 at 22:07

cheers, thats a starter.

Michaeljcox24 · 9 Mar 2011 at 09:49

I'm at 1.35V Core, and the machine is still blue screening after an hour or so of Prime.

What is the max VCore I can put in, VID is 1.28V

What is safe max temp while prime is running for this chip[?

str · 9 Mar 2011 at 10:18

Have you confirmed the memory is fine at the overclocked speed?

Michaeljcox24 · 9 Mar 2011 at 10:20

The lowest I can go with the divider is 893, which is above its 800MHZ Spec, so no. This is the speed it is BSOD at

However, on my old Q6600, I used to run at 1071,which was rock solid stable at 2.1V

str · 9 Mar 2011 at 10:35

I'm in the same boat.

My Q9450 does 3.72GHz (466 FSB) no problem at 1.36875v (1.2v VID) but even at 1.4v at 4GHz (500 FSB) it blue screens running IntelBurnTest with temps approaching 80c.

I've tried tweaking FSB term etc to allow using a lower vcore but haven't had any success.

Michaeljcox24 · 9 Mar 2011 at 12:02

And there is absolutely no documentation anywhere that gives a guide as to how much you should increase FSB term / PLL / NB.

Plenty of people saying up the Vcore, but precious little else.

twist3d0n3 · 9 Mar 2011 at 12:33

str said:
I'm in the same boat.

My Q9450 does 3.72GHz (466 FSB) no problem at 1.36875v (1.2v VID) but even at 1.4v at 4GHz (500 FSB) it blue screens running IntelBurnTest with temps approaching 80c.

I've tried tweaking FSB term etc to allow using a lower vcore but haven't had any success.

9450's top out around 3.8, so if you can achieve that, that's about all you can get

ChrisLandin · 9 Mar 2011 at 17:05

My Q9650 runs sweet at 4ghz matey on a 790i mobo. Im at work for now but when I get home this evening I will post my bios settings for you to have a go with. I think I only need 1.32vcore for 4ghz too.

Max vcore is 1.36v as rated by intel

C64 · 9 Mar 2011 at 17:08

I have a q6600 @3.6 on a p5q pro and have found that northbridge voltage makes no difference at all it's all about the cpu vcore I think it only comes in to play when you try and run a high fsb like 500 +.

CPU PLL you should only need to +2 it up from auto run mine at 1.52 but again 3.6 is still stable at auto PLL.

THC_SsSsSnake · 9 Mar 2011 at 17:54

hope you dont mind me butting in,i was about to start a new question then saw this thread so.

asus p5e,q9650,2x4gigcorsair8500,
in the bios i have set the fsb so i get 3.72. do i have to alter anything else as it is and if i want to get it higher without locking up what do i do,im a complet newb at o/c and just upped the FSB cus a friend did his,and nothing more. and are there any sites etc where i can learn about this?
thankyou

C64 · 9 Mar 2011 at 20:43

Start at the beginning and look for the overclocking guide on here or search for Q9550/Q9650 etc overclocking.

In general it's the cpu vcore that needs putting up but don't do anything until you have read up as the 45nm chips have a lower vcore threshold than 65nm.

ChrisLandin · 9 Mar 2011 at 20:49

If your going to overclock do as C64 says and read up on it, take your time. Find out max safe voltages as recommended by intel or amd and watch your cooling, dont burn up your cpu

THC_SsSsSnake · 9 Mar 2011 at 21:25

thanks guys. will do

setter · 9 Mar 2011 at 21:35

Have a read through this thread here.

http://forums.overclockers.co.uk/showthread.php?t=18159678

Lots of info on clocking the 45nm quads on the p5q range.

Michaeljcox24 · 9 Mar 2011 at 21:36

ive turned off cpu spread spectrum, nb at 1.4, pll at 1.56, fsb term at 1.36. have got vcore at 1.3625, and set a run on small fft, fsb at 446. 1.35 was getting errors after 2 mins and also forgot about spread spectrum, so turned it off. not sure if it was that that was causing the errors.

temps are maxing at 61 with the H50, ive left the machine on at home while im up the pub watching the match. never had to mess around with any of these on the Q6600, only just getting my head round it.

fingers crossed i wont have any errors when i get back

THC_SsSsSnake · 9 Mar 2011 at 21:37

thanks again

setter · 9 Mar 2011 at 21:40

When i ran my q6600 at 3.8ghz, the nb, fsb term and pll needed pretty high increases along with vcore, (1.512 iirc), my q9550 also at 3.8ghz was able to run with much lower settings on the chipset voltages, (1.216 vcore, 1.200 vid EO stepping).