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Sandy Bridge Temperature/Voltage Dilemma

post #1 of 13
Thread Starter 
Been quite a bit of discussion and different views on what is safe temperatures for sandy bridge. Last night I was pretty much for 4-6 hour straight googling and reading about temperatures and voltage recommendations for sandy bridge. Also spent quite awhile today with further research.

Majority of people have said:

Keep it below 85C

OR

Keep it below 80C

OR

Keep it below 70-75C

Just want to know your view on what's safe. For myself I haven't really decided on what's safe or not (rarely will hit those kind of temps for 24/7 usage).

Just include in your post what your Vcore/VCCIO/PLL/Multiplier/LLC is, load temperature, cooler and if you have enabled internal PLL overvoltage AND if you had any success with it in terms of temperatures and stability. Please only use prime95 blend for this.

Need to set some things straight because it could change people minds on running their sandy bridge from 4.5GHz to 4.8GHz! For example tongue.gif

What I was running yesterday:

Prime95 Blend (1 hour)
4.8GHz
Vcore - 1.40V (LLC Ultra High)
VCCIO - 1.050V
PLL - 1.80V
78C (max temp)
Internal PLL Overvoltage - Disabled (Haven't tried enabling it yet)
Prolimatech Shadow Mega

Am I safe with this? No idea, currently running it at 4.6GHz at 1.35V for now until I get some solid answers tongue.gif

Post post post!
Edited by shredzy - 3/15/11 at 7:59pm
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post #2 of 13
Prime95 Blend (1 hour)
5.0GHz
Vcore - 1.37V (LLC 2)
VCCIO - 1.050V
PLL - 1.80V
70C (max temp)
Internal PLL Overvoltage - Enabled
Watercooled

This is the 1st thread I followed regarding safe voltages:
http://www.overclock.net/intel-cpus/911402-sandybridge-take-note.html
Within that thread someone quoted Intel stating "Anything over 1.40v on air is risky, up to 1.50v on water should be OK but risky".

As far as temps go, I feel 80C should be the max. However, I believe that most of the dead chips we will start reading about will be due to deterioration caused by excessive vcore.
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post #3 of 13
Thread Starter 
Cool smile.gif

Care to shed some light on what the internal pll overvoltage actually does?
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post #4 of 13
From what I understand, the Internal cpu pll overvoltage unlocks the pll to allow higher multipliers.
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post #5 of 13
yea it doesn't raise any voltages. Intel has kept it a secret, but what it does that is bad is that it kills the ability for S3 sleep to work. it also only works on D2 stepping chips, so the majority of D1 stepping ES chips can't use it. All retail are D2.
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by Sin0822;12749278 
yea it doesn't raise any voltages. Intel has kept it a secret, but what it does that is bad is that it kills the ability for S3 sleep to work. it also only works on D2 stepping chips, so the majority of D1 stepping ES chips can't use it. All retail are D2.

Interesting. Guess Ill turn it on when I get home and see how I go. Don't use S3 sleep so I should be all good.
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post #7 of 13
Quote:
Originally Posted by drka0tic;12748489 
This is the 1st thread I followed regarding safe voltages:
http://www.overclock.net/intel-cpus/911402-sandybridge-take-note.html
Within that thread someone quoted Intel stating "Anything over 1.40v on air is risky, up to 1.50v on water should be OK but risky".

As far as temps go, I feel 80C should be the max. However, I believe that most of the dead chips we will start reading about will be due to deterioration caused by excessive vcore.

LLC alone is just as bad as running 1.55v VCore. No one truly knows the maximum safe voltage of Sandybridge simply because Intel has yet to ever state it in any of their white papers or specs sheets(Not even the Confidential ones lol).

Any of the 1.52v safe limits you read about are false, and have already been corrected by other users as the maximum amount of voltage the CPU itself can choose. This doesn't mean its safe by any measure.

One thing that is for sure is the thermal limits set by Intel of 98C tJMax and a thermal throttle of 95C.
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post #8 of 13
Quote:
Originally Posted by drka0tic;12748489 
Prime95 Blend (1 hour)
5.0GHz
Vcore - 1.37V (LLC 2)
VCCIO - 1.050V
PLL - 1.80V
70C (max temp)
Internal PLL Overvoltage - Enabled
Watercooled

This is the 1st thread I followed regarding safe voltages:
http://www.overclock.net/intel-cpus/911402-sandybridge-take-note.html
Within that thread someone quoted Intel stating "Anything over 1.40v on air is risky, up to 1.50v on water should be OK but risky".

As far as temps go, I feel 80C should be the max. However, I believe that most of the dead chips we will start reading about will be due to deterioration caused by excessive vcore.

I got that batch thinking they were "golden" frown.gif. Mine is only just average tho.

4.8ghz @ 1.43v 6 hours Prime95 blend stable.
PLL: 1.74
VCCIO: 1.05v
Max Temps: 75C

OP: What is your voltage under load? With the LLC at Ultra High I'm assuming your vcore is more around 1.45v?
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post #9 of 13
intel does state 1.52v as the maximum, people just think its too high.
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post #10 of 13
Quote:
Originally Posted by Sin0822;12749278 
yea it doesn't raise any voltages. Intel has kept it a secret, but what it does that is bad is that it kills the ability for S3 sleep to work. it also only works on D2 stepping chips, so the majority of D1 stepping ES chips can't use it. All retail are D2.

S3 sleep works fine with Internal PLL Override. I'm on a fixed multiplier however, maybe that is what affects it.

The answer is nobody knows yet. If you want opinions I would say 75-77c max unless you're doing AVX Linpack SP1 which I let go up to 80c as it's an excellent stress test, far better than prime blend 12+ hours. But again this is coming from someone that would have no regrets if his chip degrades.
Edited by Scorpion667 - 3/16/11 at 10:46am
    
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