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When is it time to stop Overclocking? - Page 4

post #31 of 55
Quote:
Originally Posted by Viridian View Post
^ Depends what you call the limits. Intel do not support voltage increases at all and most sites suggest 1.38v as the upper limit.
It does not matter what "sites" say, There's too many variables and rumors all over the place. Intel say the max is 1.52v so if that's what the manufacturer says then i'll go by that.


Edit my last post i hve booted and ran prime stable @ 5ghz for 30min but @ 78 - 80c and 1.55v im not staying here ... yet
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post #32 of 55
Quote:
Originally Posted by Chewy View Post
It does not matter what "sites" say, There's too many variables and rumors all over the place. Intel say the max is 1.52v so if that's what the manufacturer says then i'll go by that.


Edit my last post i hve booted and ran prime stable @ 5ghz for 30min but @ 78 - 80c and 1.55v im not staying here ... yet
Where do Intel say 1.52v? Because I spoke to an Intel rep and they said Intel do not support voltage changes at all, let alone 1.52v and the rep would not comment on the 1.52v number.

http://www.intel.com/support/feedbac...roup=processor

I used their LiveChat customer support.

You can't use the tech sheet as a gauge for the maximum safe voltages. That's like reading the tech sheet for, say, a car and figuring out that the top speed of the car is 100MPH, that doesn't mean running the car at 100MPH 24/7 is good for it. The car would probably fall to bits.

The websites I talk about are places like HardOCP, Anandtech and OverclockersUK, the last one actually sell these CPU's professionally, and they don't recommend going over 1.38v, at all, for any length of time (though, awesomely, they'll still honour warranties for burnt out chips! =D)

You also have to remember that voltage resistance decreases with clockspeed AND that yeah, you could be using LN2 and keeping temps super cool and still damage and burn out the CPU with overvoltage.

Protip: try the LinX with AVX extensions =D they really stress out SB CPU's
Edited by Viridian - 4/30/11 at 5:10am
    
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post #33 of 55
temps stop me at 65c Intel 55c amd
and I hit a walls past 4ghz on my sig rig
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post #34 of 55
Do you limit yourself by temperatures? If so, what is your personal threshold at 100% load?

85C. People say 75C because they want to be cautious, but there is nothing wrong with 85C.

Do you limit yourself by voltages? If so how much?

That's a trick question.
Every CPU, or rather every die size, has its maximum safe voltage.
I could run 1.6v 24/7 on my Q6600 (65nm), but on my Q8400, I got 102C.

Do you limit yourself by a specific clock? If so what speed?

Why would anyone do that?

Does the CPU limit you? Would you try to get the highest clock you could for a 24/7 rig if you could?

Yes, of course!
Benchmarking and proving you can get a high frequency are nice, but useless.
If you can actually get 5.0Ghz and USE it, as in, 24/7, let alone fold with it, that's what really counts.
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post #35 of 55
Quote:
Originally Posted by Track View Post
Do you limit yourself by temperatures? If so, what is your personal threshold at 100% load?

85C. People say 75C because they want to be cautious, but there is nothing wrong with 85C.

Do you limit yourself by voltages? If so how much?

That's a trick question.
Every CPU, or rather every die size, has its maximum safe voltage.
I could run 1.6v 24/7 on my Q6600 (65nm), but on my Q8400, I got 102C.

Do you limit yourself by a specific clock? If so what speed?

Why would anyone do that?

Does the CPU limit you? Would you try to get the highest clock you could for a 24/7 rig if you could?

Yes, of course!
Benchmarking and proving you can get a high frequency are nice, but useless.
If you can actually get 5.0Ghz and USE it, as in, 24/7, let alone fold with it, that's what really counts.
Erm, 85C is not safe on either Sandy Bridge or Core2. The max temp for a Core2 is 76C and 73C on SB. 85C is NOT safe. Most people like to keep their 100% load temps at 60C or there abouts...
Edited by Viridian - 4/30/11 at 6:42am
    
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post #36 of 55
Quote:
Originally Posted by Viridian View Post
Erm, 85C is not safe on either Sandy Bridge or Core2. The max temp for a Core2 is 76C and 73C on SB. 85C is NOT safe.
That's not what I believe.
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post #37 of 55
Quote:
Originally Posted by Track View Post
That's not what I believe.
That's really, really bad luck for your wallet, then:

http://ark.intel.com/Product.aspx?id=52210

It's actually 72.6C, not 73C.

Believe what you like, though Doesn't matter to me!
    
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post #38 of 55
My core 2 gets to 80c on IBT and im not worried i also wont stop OCing my 4650 untill its at either 130c or 1 ghz core clock.
post #39 of 55
I will do it till I see no gains in gaming. I was going to go with a 2600k, but I went with a 920 and I can't wait for it to get here.
    
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post #40 of 55
Quote:
Originally Posted by Viridian View Post
Where do Intel say 1.52v? Because I spoke to an Intel rep and they said Intel do not support voltage changes at all, let alone 1.52v and the rep would not comment on the 1.52v number.

http://www.intel.com/support/feedbac...roup=processor

I used their LiveChat customer support.

You can't use the tech sheet as a gauge for the maximum safe voltages. That's like reading the tech sheet for, say, a car and figuring out that the top speed of the car is 100MPH, that doesn't mean running the car at 100MPH 24/7 is good for it. The car would probably fall to bits.

The websites I talk about are places like HardOCP, Anandtech and OverclockersUK, the last one actually sell these CPU's professionally, and they don't recommend going over 1.38v, at all, for any length of time (though, awesomely, they'll still honour warranties for burnt out chips! =D)

You also have to remember that voltage resistance decreases with clockspeed AND that yeah, you could be using LN2 and keeping temps super cool and still damage and burn out the CPU with overvoltage.

Protip: try the LinX with AVX extensions =D they really stress out SB CPU's
Page 78

http://download.intel.com/design/pro...hts/324641.pdf

Although i agree i would not want to go near that voltage i also do not agree with 1.38v being the max safe voltage just because so called reviewers say so, Also if you do a forum search you will see there are plenty of posts where people have spoken to intel live support and everyone has been told that 1.52v is max safe voltage, Im yet to see a thread anywhere on the internet of somebody blowing their cpu from high voltage and many run 1.5v+ 24/7 Overclockers uk were screaming dont go above 1.32v when sb first came out!
Edited by Chewy - 4/30/11 at 3:26pm
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