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>>The Official ASUS P8P67/P8Z68 & P8Z68/GEN3 Series Owners Club>> - Page 841

post #8401 of 9343
Quote:
Originally Posted by Daffie82 View Post

Can not say out of the top of my head, will check it when I'm home and let you know.
Will post all my settings so you can compare.

Thanks. It's just that most people here recommend to disable those states when using Offset because that was the dissiminated info.
post #8402 of 9343
man been gone a few days and the C-States talk still goes on....
gonna go back and read and then drop my two cents..
I have a negative offset of -0.040, LLC medium and phase control set to optimized.
4.5GHz max voltage is 1.312v and lowest voltage is 0.960.
all C-States are auto or enabled.
post #8403 of 9343
Quote:
Originally Posted by malmental View Post

4.5GHz max voltage is 1.312v and lowest voltage is 0.960.
all C-States are auto or enabled.
You might want to check whether C States are really enabled or not when setting them to auto. On my computer, currently overclocked, with C3/C6 states set to auto, they're actually disabled. I didn't check with stock clock though. You can check them using RealTemp T|I version from a couple pages back. If they always 0% when idle, that means C3/C6 states are disabled.
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post #8404 of 9343
As soon as you start overclocking, many motherboards disable the C States automatically. When using the bios AUTO setting, you will have no idea if they are enabled or not unless you do some testing with the RealTemp T|I Edition.

My opinion is that C3 and C6 get the blame for instability issues when the real problem is the offset voltages that are being used.

When using C3 and C6, use a fixed voltage. CPU-Z should report the same speed and voltage whether your CPU is idle or fully loaded. Users still have these beliefs that this will waste power, create extra heat when idle or cause unnecessary wear on their CPU. None of that is true when using C6.

When set up like this, your CPU will be getting its fixed voltage when it is in the C0 state working on a task and as soon as it finishes a task, it will immediately drop down to C6 where the voltage drops down to nearly zero. Your cores will rapidly transition back and forth between C0 and C6 and they will spend as little time as possible in all of the other intermediate C States. That is exactly what you want. When a task needs to be completed, you want the CPU core to quickly get into C0, work at full speed, get the task done and then get back into C6 as soon as possible. The faster your CPU works in C0, the bigger percentage of time it will be able to spend in C6, running cool and saving power. When using C6, you should also be using the Windows High Performance profile. Running a CPU slowly to save power is a myth.

Power Optimization – a Reality Check
http://www.cs.berkeley.edu/~krioukov/realityCheck.pdf
post #8405 of 9343
Quote:
Originally Posted by unclewebb View Post

As soon as you start overclocking, many motherboards disable the C States automatically. When using the bios AUTO setting, you will have no idea if they are enabled or not unless you do some testing with the RealTemp T|I Edition.

My opinion is that C3 and C6 get the blame for instability issues when the real problem is the offset voltages that are being used.

When using C3 and C6, use a fixed voltage. CPU-Z should report the same speed and voltage whether your CPU is idle or fully loaded. Users still have these beliefs that this will waste power, create extra heat when idle or cause unnecessary wear on their CPU. None of that is true when using C6.

When set up like this, your CPU will be getting its fixed voltage when it is in the C0 state working on a task and as soon as it finishes a task, it will immediately drop down to C6 where the voltage drops down to nearly zero. Your cores will rapidly transition back and forth between C0 and C6 and they will spend as little time as possible in all of the other intermediate C States. That is exactly what you want. When a task needs to be completed, you want the CPU core to quickly get into C0, work at full speed, get the task done and then get back into C6 as soon as possible. The faster your CPU works in C0, the bigger percentage of time it will be able to spend in C6, running cool and saving power. When using C6, you should also be using the Windows High Performance profile. Running a CPU slowly to save power is a myth.

Power Optimization – a Reality Check
http://www.cs.berkeley.edu/~krioukov/realityCheck.pdf

Hmmm, this is interesting. This could change all the explanations regarding power saving benefits of Offset.

In my case, why is it that when I enable C3 and C6 I immediately get a BSOD upon entering Windows? I'm using Offset and am stable when these two states are disabled. What is the relation of Offset to these two states?
post #8406 of 9343
after we all get to the bottom of this can we consider ourselves ASUS mobo masters... biggrin.gif
this is really some educational crap going on.
rename this to the Ultimate ASUS mobo P8 thread.
post #8407 of 9343
lol

I too am amazed how my simple question about c states turned into a multipaged week long discussion. biggrin.gif

Sad part is I havent had anytime to up my clock. Have to find out what my stable voltage for 4.5 onmy 2500k is first then I can start playing with offset mode again.
   
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post #8408 of 9343
it is fun tuning or re-tuning clocks, especially after you learn about new tricks / techniques that might be beneficial.
just a learning process in general is cool.
smile.gif
post #8409 of 9343
Quote:
Originally Posted by malmental View Post

it is fun tuning or re-tuning clocks, especially after you learn about new tricks / techniques that might be beneficial.
just a learning process in general is cool.
smile.gif

Couldn't agree more. And it takes a lot of patience when experimenting smile.gif
post #8410 of 9343
A long process indeed.

Fun as well, so long your daughter doesnt start working on her school project only to get blue screened on an unstable overclock!doh.gif
   
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