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post #8211 of 9343
Quote:
Originally Posted by sinnedone View Post


Thanks, Gonna have to try that when I get my system back together.

Right now Im using a negative offset with I forget what llc and all c states enabled. Im at 4.2ghz @2.4v on a 2500k and want to see if i can get it stable and cool at 4.5ghz.


Is there anything online that explains what the c states do and how they interact with windows?

 

Use whatever offset needed that gets you the core voltage that keeps your system stable.  So, the type of offset you're using (and the exact offset) is really for your information only.

 

Anyway, just a heads up: 4.5 GHz usually needs roughly 1.348-1.356V (about 1.35V).

 

I don't know if there's anything explaining C states and how they interact with Windows.  I haven't looked that information up because it hasn't become something I need to know yet.  I just keep my Windows set so that there's really no power-saving except for turning my monitor off.

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post #8212 of 9343
Quote:
Originally Posted by TwoCables View Post

Then use an Offset core voltage, leave C1E enabled but C3 and C6 disabled. 

Just out of curiosity, what would be the reason(s) for disabling C1E? Seems like having low idle voltages is a good thing. Is it so the CPU is essentially always powered up and ready for top speed immediately?
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post #8213 of 9343
Quote:
Originally Posted by am dew1 View Post


Just out of curiosity, what would be the reason(s) for disabling C1E? Seems like having low idle voltages is a good thing. Is it so the CPU is essentially always powered up and ready for top speed immediately?

 

Well, regardless; it's always ready for top speed immediately.  These CPUs are very well-made in that respect.

 

As far as I know, I've only seen one reason for disabling C1E for Sandy or Ivy Bridge:  to help with stability if you decide to start adjusting the BCLK.  So as long as you leave the BCLK at 100.0 MHz, then you can leave C1E (and EIST) enabled.

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post #8214 of 9343
Quote:
Originally Posted by sinnedone View Post

Thanks, Gonna have to try that when I get my system back together.

Right now Im using a negative offset with I forget what llc and all c states enabled. Im at 4.2ghz @2.4v on a 2500k and want to see if i can get it stable and cool at 4.5ghz.


Is there anything online that explains what the c states do and how they interact with windows?

Here are a few links explaining C-states (and other power management features):

http://impact.asu.edu/cse591sp11/Nahelempm.pdf

http://www.anandtech.com/show/2919/4

And the Intel Second Generation datasheet has a good definitive description (pre-Haswell) in the Power Management section:

http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/2nd-gen-core-desktop-vol-1-datasheet.pdf
post #8215 of 9343
In general, C1E is for idle, C3 and C6 are for Sleep/Hibernation. If you never use Sleep/Hibernation like me, you can safely disable C3/C6. It's suggested to disable them in Offset mode because many people ran into BSODs when machine is idling or light load(web). However, there was some SSD issues in Offset mode and C3/C6 Disabled, i can't remember specifics.
Edited by Catscratch - 2/5/13 at 11:38am
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post #8216 of 9343
If you have an SSD and are running Intel IRST (at least on the Intel 6 chipset), having any of the C states enabled (including C1E) enabled can adversely affect your random write performance. I just use EIST and disable all of the C states in BIOS.
Edited by GeneO - 2/5/13 at 11:47am
post #8217 of 9343
not running Intel IRST personally on any of my units.
post #8218 of 9343
Hi,

I'm wondering why Cpu-Z doesn't show the real voltage, only VID on my P8Z68-V/GEN3 on Windows 7, while on XP (in fact, server 2003) it does. It doesn't start if in its INI file the value "sensors" is 1.

Example:

Sensor=0 -> CpuZ starts
Sensor=1 -> CpuZ hangs

On Server2003 it doesn't care. It's dual boot with latest drivers for the corresponding OS.

I also noticed that MEInfo and MEI Update from the MEI package don't work on Win7 (hang with no response), while work normally on Serv2003. Does Win7 block the sensor interface (direct hardware access)?

GL
Edited by Grof Luigi - 2/5/13 at 2:08pm
post #8219 of 9343
Quote:
Originally Posted by Catscratch View Post

C3 and C6 are for Sleep/Hibernation. If you never use Sleep/Hibernation like me, you can safely disable C3/C6.
That is incorrect. C3 & C6 is one of the CPU sleep states. It's not for computer sleep/hibernation function. It is useful to bring down power consumption when idling. When CPU core doesn't have job, it will enter one of these states & this help reduced power consumption. For example, when CPU core enter C6 state, voltage is reduced to zero, hence the power consumption also zero.

For locked CPU (not overclockable), C3 & C6 states help CPU enter Turbo Boost. For unlocked CPU, it's useful for low power consumption when idling.
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post #8220 of 9343

Alright, well now I have LLC set to Medium, C3 and C6 are enabled, and my Offset is +0.065V - and it used to be Ultra High, C3 and C6 disabled, and offset was +0.005V.  My idle voltage is still sitting at just a hair over 1.0V, but it was below 1.0V when I was still increasing my offset up to +0.065V.  The first offset I tried is +0.040V, then I went to +0.055V, and then I put it at +0.065V.  When I reached +0.065V, my idle voltage became identical to what it was with Ultra High, +0.005V and C3 and C6 disabled.

 

I'm not sure if I'll keep this, but with the talk of how a lower LLC reduces VRM temps, I just might.  I have the exact same idle and load voltages as before.

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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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