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Q9550: Can't get stable passed 3.4Ghz!!

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October 2, 2009 9:48:24 PM

Hey all!

Having trouble trying to get chip stable passed 3.4ghz. Right now its very stable at:
3.4ghz / 1.228v. Had it prime stable at 3.6ghz with 1.265v, but it would still fail during gameplay. Tried again last night to get stable at 3.7ghz / 1.300v and still could not pass prime95. Here is a list of voltages and hardware to see if anything stands out:

3.7ghz / 1.300v (447 x 8.5) (i'm thinking this voltage is plenty for the clock speed. I have never come across a C1 that needed that much voltage even for speeds of 3.8 to 4.0)
550w Antec Truepower
ASUS P5Q mobo / P45
8gb (4x2gb) Mushkin Ascent ddr2-8500 @ 2.10v (was at 890mhz, 5-5-5-18 for testing. At 400 fsb it runs at 4-4-4-12, 800 mhz)
NB = 1.30v
SB = 1.20v
volt term = auto
C1 stepping = ON

Any help is greatly appreciated!!!

Thanks!

RM
October 2, 2009 9:56:38 PM

turn off c1 and test
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October 2, 2009 9:59:52 PM

Your probably going to have to go higher on your north bridge voltage. You should trouble shoot. What I do it turn down the multiplier, but leave the fsb/ram overclocked and see if it crashes. I'm not very good at expressing myself, but it's like this, 447x7=3129. If you know at say 1.25 volts it's stable at 3.129 ghz, but your not sure if the north bridge or ram can handle the speeds you'll be isolating it as the culprit since your cpu is at a speed and voltage you know it can handle. I had to have my northbridge a lot higher than that to get a good overclock. The other way is when you run prime95, just test the cpu and not the ram.
Try giving your north bridge more juice first IMO.
I had memory errors till I went to 1.38volts on the northbridge to get to 3.6ghz, but I'm running a E8400.
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October 2, 2009 11:27:20 PM

+1 on trying to up the NB voltage a little.
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a b K Overclocking
October 2, 2009 11:31:07 PM

FSB termination to 1.3 if you have it may help as well.
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October 3, 2009 2:49:44 AM

Wow! Thanks so much for all the responses!

ATM, I'm going on 5 hours of prime stable at 3.6ghz/1.265v!

Thanks to the above suggestions:

C1 = OFF
NB = 1.34v (up from 1.30v)
VTT = 1.20v (up from 1.10v)
SB = 1.20v
Dram voltage = 2.08v

I even played some rounds of COD: WAW on full settings to make sure it wouldn't crash again. Gonna run Prime all night.
This is my first system that I decided to OC. More of a hobby than an enthusiast. Looking for 24/7 stability for gaming, and to have a bit of fun tinkering around.

I could prob. get a lot higher with the cooling I have, and I still have a bit of room on the voltages. Would upping the FSB anymore make any real difference? Or is this a good OC for realistic applications.

Thanks again for all your input!

RM
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October 3, 2009 6:24:54 PM

ur OC is awesome in fact.
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October 17, 2009 1:30:52 AM

ehh well, to no avail!

no matter what I do I cant get it stable passed 3.4ghz 8(....

p45, great ram, good voltages... I don't get it.... Even after 24hrs prime95 stability, clean memory tests, removing 2 DIMMS, I keep getting a periodic BSOD:
stop 0x00000124 error, only on clocks above 3.4ghz. Pretty disappointing for a pretty good OC setup.
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a c 239 K Overclocking
October 17, 2009 10:54:58 AM

rmerwede said:
3.7ghz / 1.300v (447 x 8.5) (i'm thinking this voltage is plenty for the clock speed. I have never come across a C1 that needed that much voltage even for speeds of 3.8 to 4.0)


This reference to C1 is your CPUs original core stepping right, not the BIOS referenced C1, Right?

The reason for my question is because it does take more Vcore to get where you want with that stepping of the Q9550, I have a completely different M/B than you, and I'm running my Q9550 at 3.83G rock solid P95 and Gaming.

However my Vcore is at 1.38750v.
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a c 197 K Overclocking
October 17, 2009 4:16:32 PM

The combination of a C1 stepping and a higher than average VID makes for a not particularly good overclocker. That's the same situation I am in with my Q9550.

I am stable at 3.7 GHz. and can boot at 3.8 GHz when running at the top of Intel's maximum recommended voltage. I turned it down a bit and am running it at 3.6 GHz.
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October 18, 2009 2:31:05 AM

wow that's some crazy voltage lol...

yes it's the C1 revision. It just boggles me that I can run 24 hours of prime95 stability, pass all the tests, and still get this pesky BSOD. It seems to be very stable and running great until it happens. But the fact that it only happens over ~3.4ghz leads me to believe that I am either missing something, or the testing is.

Again, thanks for the replies!
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October 19, 2009 10:36:35 PM

Are you testing both the ram and memory? Do you have round off checking checked?
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October 20, 2009 10:25:18 AM

I got my Q9550 to 3.88 GHz ish, and I was using a bad motherboard (that has now about given up) I have a list of voltages I used (that I got from searching google) somewhere on my desk at home, If I remember I'll get you them when I get home today. I was cooling on water mind.
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a c 239 K Overclocking
October 20, 2009 2:43:14 PM

rmerwede said:
wow that's some crazy voltage lol...

yes it's the C1 revision. It just boggles me that I can run 24 hours of prime95 stability, pass all the tests, and still get this pesky BSOD. It seems to be very stable and running great until it happens. But the fact that it only happens over ~3.4ghz leads me to believe that I am either missing something, or the testing is.

Again, thanks for the replies!


crazy voltage?

Not really you'll probably have to get crazy yourself to attain your goals or settle for less, thats going to be completely up to you.

After downloading and looking over your M/B manual, I'd say to get a good OC from your M/B is going to be a juggling act between, CPU Voltage, PLL Voltage, NB Voltage, with a few side settings involved, and some features disabled.

For example my settings at 3.4G
CPU Voltage = 1.31250v
PLL Voltage = 1.50v
NB Voltage 1.30v

However even though we have the same CPU stepping, we have completely different M/Bs, and I have way more OCing BIOS features over your available settings, like VTT, GTL, which you do not have, but your M/B should be setting those automatically in relation to your PLL setting.

I think you'll be able to gain a higher stable OC, but you'll get there at a higher CPU voltage, than you're presently running.

FYI: Your VID Voltage range Intel Spec is (0.85v - 1.3625v)
Thermal Limit is 71.4c



And the Operating System Is ???
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a c 239 K Overclocking
October 20, 2009 3:27:24 PM

BIOS Setting Suggestions;

Load Line Calibration Disabled
CPU Spread Spectrum Disabled
PCIE Spread Spectrum Disabled

Under Advanced Tab
CPU Configuration
CPU Ratio Set as Needed or Auto
C1E Support Disabled
Max CPUID Value Limit Disabled
Intel Virtualization Tech Disabled
CPU TM Function Enabled
Execute Disable Bit Disable
Intel Speed Step Disable


Note; Manually set your DDR2 memory voltage and timings to your manufacturers specs.
Your memory may very well be your Achilles heel, it didn't seem to be that great of an OCing performer from what I've read about it, but don't let that discourage your efforts.
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October 20, 2009 5:30:53 PM

hi all u guys use something i dont understand where is NB voltage in bios? wheres VTT?
Where is SB? what is C1?

will be thanked if helped
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October 20, 2009 5:33:28 PM

i overclocked my q9550 to 3.2 ghz at 1.275volt in vcore and i changed nothing just this one and it worked but i wanna know what should i do for next steps what are the voltages?

my rams are ddr2 800
mainboard : Gigabyte Ga-Ep45-UD3L



help me :D 
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October 21, 2009 12:19:45 AM

Hi all!

I know the C1 revision isn't as good as its brother the E0 so I would expect the voltages to be a bit higher. I run 3.4ghz at 1.212v completely stable. Seems like such a big jump for 200-400 more mhz.... I am on Windows 7 RC x64 btw ;) 

Quote:
i overclocked my q9550 to 3.2 ghz at 1.275volt in vcore and i changed nothing just this one and it worked but i wanna know what should i do for next steps what are the voltages?


That voltage seems a bit high for running 3.2ghz, especially on that chipset. You could prob run that speed on minimal vcores (anything greater than 1.21-1.23v) and not need to touch the rest of your voltage settings. (at least this is what I have experienced with a modest OC.). Im only a novice with this setup so this may help:

http://www.tomshardware.com/forum/240001-29-howto-overc...

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!