What is the average OC for a Q9550?

havoti97

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Nov 13, 2005
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Just want to know what I'm missing here. I'm running a q9550 on an Abit IP35 Pro at 3.6 GHz 424x8.5. Default Vid was 1.225, current Vcore is set at 1.275. Memory is at 424 MHz 4-4-4-12 (Crucial Ballistix 4GB kit, programmed with up to 500MHz in the SPD). I can't seem to have the system stable past 3.6 GHz. It will boot at 3.8 GHz but prime95 is not stable.

My question is, what are people getting on average with their q9550 and and what voltage? Thanks.
 

ashishmishra

Senior member
Nov 23, 2005
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Intel specifies the max VID as 1.3625, so that upto value is safe for 24/7 operation. However you can lower your need for higher core voltage by playing with CPU & FSB VTT, CPU PLL values as well, NB voltage might need to be increased as well. Be very careful so as not to over-volt the VTT for CPU and FSB and CPU PLL as that has the potential to kill your CPU regardless of CPU core voltage.
 

n7

Elite Member
Jan 4, 2004
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If it wasn't for the crippling low 8.5x multi, they'd all be doing 4+ GHz w/ good cooling.

Basically, you'll run into FSB limitations before you can ever hit the chip's max.
 

dguy6789

Diamond Member
Dec 9, 2002
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Originally posted by: n7
If it wasn't for the crippling low 8.5x multi, they'd all be doing 4+ GHz w/ good cooling.

Basically, you'll run into FSB limitations before you can ever hit the chip's max.

QFT. I'm happy with 3.4Ghz anyways :)
 

Raventon

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Jul 29, 2008
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i am running on a 475fsbx8.5=4.05ghz it require only a 1.288vcore in cpu-z and 1.3125 vcore in bios..
 

n7

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Jan 4, 2004
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Originally posted by: Raventon
i am running on a 475fsbx8.5=4.05ghz it require only a 1.288vcore in cpu-z and 1.3125 vcore in bios..

Stability screenies? :)

Is that E0 or C1?
 

crouthamel

Junior Member
Aug 21, 2008
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3.6125 is stable for me, with a Vcore of 1.335 (bios), 1.32 (CPU-Z) and a FSB voltage of 1.3 (eVGA 780i FTW board). I can probably lower the vcore a bit more and achieve the same stability. Just need to find the time to set, reboot, test, set, reboot, test .... bah.

I was able to get 3.7 by raising the FSB voltage to 1.4. However, I have read that using that voltage for the FSB can kill your Q9550 or any 45nm chip. Not sure how true that is though.

 

Raventon

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Jul 29, 2008
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mine is a E0 chip..i din take any stability screenies..if really wanted i can do a stability test thou it will take awhile..wad test do you prefer?:)
 

n7

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Jan 4, 2004
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Originally posted by: Raventon
mine is a E0 chip..i din take any stability screenies..if really wanted i can do a stability test thou it will take awhile..wad test do you prefer?:)

LinX or IntelBurnTest preferably, though i'll be honest, i'm doubting your claims of stability @ your stated clockspeed/voltage hence why i asked for the screenies ;)

P95 would be fine too (25.6)
 

Raventon

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Jul 29, 2008
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how do i upload pictures in this forum??lol i cant find the insert picture option...and i dun have a host site..or maybe you wan me to sent a email to you?i have got the screenshot ready:)
 

Raventon

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Jul 29, 2008
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http://www.imagebam.com/image/14fa2516396753

http://www.imagebam.com/image/f550d416396755

http://www.imagebam.com/image/2442cb16396757

lol...all of them are quite really short test..and some of the has got wrong dates on them..that was becos when i attempt to lower my tRD my mobo seems to mess up the date and time...need to adjust it back manually after a fail overclock everytime..

thou you can doubt the stability and i am not trying to convince you to believe it is 100% stable...but wad i can say is tat so far i have not experience any signs of unstability.no BSOD no crash applications..however during the process of overclocking i did experienced once the RED SCREEN OF DEATH..it excites me quite abit..lol its the first time in my life i saw a RED SCREEN OF DEATH.
 

n7

Elite Member
Jan 4, 2004
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Very nice. :thumbsup:
Getting IBT stable @ 475 FSB is impressive.

What cooling?

I'm assuming rather good water?

 

Raventon

Member
Jul 29, 2008
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thanks..preivously i was using the TRUE with two Noctua P12...the max loading temp is 65..i dun really like it so i have recently change to a swiftech Compact 220 extreme kit..now my max loading temp is at 58.
 

havoti97

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Nov 13, 2005
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I was struggling but couldn't get anything past 424 MHz FSB on the Abit IP35 Pro. That is a bit strange for this board. A little research and I upgraded the BIOS to version 17 (which is not on the official abit website for some reason). Now I'm stable at 3.8 GHz with 448 MHz FSB, still testing to see the upper limit. Currently vcore is only 1.325. This is freaking amazing, considering the q6600 G0 vcore I upgraded from started at 1.325.
 

rogue1979

Diamond Member
Mar 14, 2001
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Originally posted by: n7


LinX or IntelBurnTest preferably, though i'll be honest, i'm doubting your claims of stability @ your stated clockspeed/voltage hence why i asked for the screenies ;)


No matter how you say it, that just doesn't sound nice!
 

n7

Elite Member
Jan 4, 2004
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Originally posted by: rogue1979
Originally posted by: n7


LinX or IntelBurnTest preferably, though i'll be honest, i'm doubting your claims of stability @ your stated clockspeed/voltage hence why i asked for the screenies ;)


No matter how you say it, that just doesn't sound nice!

:p

Well, i am working hard to eat my own words.

I got my Q9550 a few days ago, & got it to pass IBT @ 4 GHz (471 FSB).

Today i'm working on P95 Blend, which is oddly harder to get stable than IBT for some reason.

I will say that once you hit over 450 on my board though, holy crap it gets hard to move up without a lot more voltage, at least for me anyway.
 

BoboKatt

Senior member
Nov 18, 2004
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Got my Q9550 running 3.51 on stock voltage (based on what VID shows on CoreTemp) which is 1.185. I was shocked that I did not have to raise that but I did up some of the other v's in my bios for my Asus P5K-E (P35) mobo. Thus 8.5 X 412. I never tried anything higher since this runs so well and so cool under my TRUE.

I set it in my bios 1.185 but it shows way lower when I check CPU-Z. Problem now is my RAM. I have 4 sticks of ram for a total of 8GB but with all 4 slots filled my RAM which is rated at 1000mhz 5-5-5-12 wont do that period. Thus had to work the strap and now the RAM is just over 800mhz. Anyhow that's off topic but very impressed with these chips.

 

Concillian

Diamond Member
May 26, 2004
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Originally posted by: n7

I got my Q9550 a few days ago, & got it to pass IBT @ 4 GHz (471 FSB).

Today i'm working on P95 Blend, which is oddly harder to get stable than IBT for some reason.

I will say that once you hit over 450 on my board though, holy crap it gets hard to move up without a lot more voltage, at least for me anyway.

Aren't you largely facing FSB / NB issues at that point (over 450)? This would mean that hardcore CPU testing (IBT / Small FFT), which use small routines that fit in cache would not stress your most likely failure mode (FSB / NB).

To me, it makes sense that P95 blend would give you more grief than IBT. I think OCCT is quickest for good FSB / memory testing.