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Q9550 at 4.0GHz

post #1 of 45
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Hello OCN!

I was just wondering If I can continue running my Sig Rig at 4GHz. It is stable and I can run IntelBurn overnight without any lock-ups. I have never pushed my CPU above 4 GHz. I am planning to get a Koolance water block and let my CPU run with 1/2" tubing on a 2x120 RAD and 1X120mm Rad and try to push a liitle bit more, say like 4.2GHz or whatever I can get when running 2000MHz FSB.

I am worried about the 1.4 volts as the specs says this cpu can only take 1.3625 volt.

Thanks.
Edited by rheicel - 5/14/11 at 11:12pm
    
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post #2 of 45
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anyone?
    
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post #3 of 45
1.3625V is just the top end of the VID Voltage Range, not the maximum safe core voltage. The VID Voltage Range is the range of voltages that can be achieved when the voltage is set to Auto, however the actual maximum safe core voltage is 1.45V. So that's one of the reasons for not using Auto because we sometimes need to exceed 1.3625V.

So when you say you're using 1.4V, is that the selected voltage in the BIOS? Or is that what you're seeing in CPU-Z?


Quote:
Originally Posted by rheicel View Post
anyone?
Can you be just a little more patient?! You're not the only one asking for help here on OCN. So when you make a new thread, it's best to wait 12-24 hours for a reply, not 4 minutes! Hell, I think it took me about 4 minutes just to type up my reply!
Edited by TwoCables - 5/14/11 at 11:18pm
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post #4 of 45
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
So when you say you're using 1.4V, is that the selected voltage in the BIOS? Or is that what you're seeing in CPU-Z?
Hi There, this is the setting in BIOS. I can see about 1.42 in CPU-z.
Edited by rheicel - 5/14/11 at 11:22pm
    
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post #5 of 45
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
Can you be just a little more patient?! You're not the only one asking for help here on OCN. So when you make a new thread, it's best to wait 12-24 hours for a reply, not 4 minutes! Hell, I think it took me about 4 minutes just to type up my reply!
Sorry Mate, I think i have offended OCN by being so sarcastically in a hurry. I deeply apoligise for my action.
    
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post #6 of 45
So long as your temps are tolerable you are fine at that voltage. I would say a good rule of thumb for the Q9xxx series is no more than 65c at full load, obviously you can go higher than that, but anything more than 70c is really pushing it.

Even beyond 70c, Intel processors are designed to throttle at high temps, and even shut down if temps reach critical.

If your 65c at load with your Q9550 and are at 1.4v, then by all means your solid. So long as your truly stable. Any upgrade in cooling is just going to lower your load temps, and possible increase your headroom for further overclocks.

Edit: Just an fyi, I am able to run at 4.0 on my cpu, and I honestly notice no difference between that and 3.8ghz. If your really looking to push your processor, and you have the money to sink into a WC system, go for it. If your looking for true performance, an upgrade would yield the best gains, IE. an I7 2600k system.

Im not saying that the Q9550 isnt awesome, cause it is, but if your really looking to spend money on better performance, the SB setups are really the best bang for the buck.
Edited by Mattb2e - 5/14/11 at 11:26pm
post #7 of 45
I concur, you can do 1.45v safely.


Since when does Corsair have a Denominator series of RAM?
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post #8 of 45
Quote:
Originally Posted by rheicel View Post
Hi There, this is the setting in BIOS. I can see about 1.42 in CPU-z.
1.42V in CPU-Z is getting close, but as long as your temps are less than approximately 70°C, then you should be safe from getting frustrating instability.

Quote:
Originally Posted by Mattb2e View Post
So long as your temps are tolerable you are fine at that voltage. I would say a good rule of thumb for the Q9xxx series is no more than 65c at full load, obviously you can go higher than that, but anything more than 70c is really pushing it.

Even beyond 70c, Intel processors are designed to throttle at high temps, and even shut down if temps reach critical.

If your 65c at load with your Q9550 and are at 1.4v, then by all means your solid. So long as your truly stable. Any upgrade in cooling is just going to lower your load temps, and possible increase your headroom for further overclocks.
But ~70°C isn't anywhere near the maximum safe temp for these CPUs. It's closer to 100°C because that's what the Tj. Max is. Of course, there'd be tons of instability if temps were to reach the 70°Cs due to the high core voltage.
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post #9 of 45
Thread Starter 
Quote:
Originally Posted by PowerTrip View Post


Since when does Corsair have a Denominator series of RAM?
hahaha, spot on mate! you made my day! Done editing, cool! +1
    
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post #10 of 45
Quote:
Originally Posted by TwoCables View Post
1.42V in CPU-Z is getting close, but as long as your temps are less than approximately 70°C, then you should be safe from getting frustrating instability.


But ~70°C isn't anywhere near the maximum safe temp for these CPUs. It's closer to 100°C because that's what the Tj. Max is. Of course, there'd be tons of instability if temps were to reach the 70°Cs due to the high core voltage.
I updated my post to include further information, please read that as well.


In regards to temps. The lower the better, the higher you run as far as temps go the shorter the lifespan of your cpu will be, same goes with excessive voltage. 65C is really just a suggestion, as I stated, Intel has safety provisions that will throttle the CPU when temps get too high, and shutdown when reaching critical temps.

Its really all dependent on personal preference. If you feel you want to run your CPU at 80c then by all means do it. However it may not last as long as a CPU at much lower temps.
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