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i7 2600k Overclocking with EIST/SpeedStep

post #1 of 9
Thread Starter 
Hello guys,

I have been able to successfully overclock my 2600k using Theocnoob's overclocking guide. I reached 4.5GHz at Vcore 1.31. Right now I am using the manual method of adjusting the Vcore so my CPU frequency is constantly at 4.5GHz and Vcore is at 1.31v 24/7. What I would like to achieve next is to have my CPU throttle down in frequency and Vcore when idling and have it jump back to my overclocked speeds and Vcore when on load.

After doing some research I figured out that in order to achieve this, I need to enable EIST/SpeedStep and in conjunction use the "offset" method of setting the Vcore instead of "manual."

I am still confused about what the offset applies to. I read somewhere that with using the offset method Vcore = VID + Voffset. What exactly is VID and what does it effect? I also see something called "Vdroop" being mentioned alot in the forums. Can you please explain this voltage also?

I guess my plan of attack right now will be to enable EIST/Speedstep, keep C1, C3, and C6 disabled, and then set my Vcore to "Offset" instead of "Manual" and then mess with the offset value whether it be "+" or "-". What do you think?

Can you please give me some example values of that to try in terms of the offset values?

Right now I have a 8 hour Prime 95 Blend stable overclock at 4.5GHz with 1.310 volt Vcore using the manual method. So I assume that whatever I do I need to make sure that once all is said and done with EIST/Speedstep, whenever load kicks in it goes back up to that voltage from whatever it was when the PC was idling to maintain the 4.5GHz stability. But I am still unsure on how to do this. Can you please give me some pointers?

Here are my system specs:

Intel i7-2600k Sandy Bridge@4.5GHz
ASUS P8Z68-V/GEN3 PRO
G.Skill Ripjaws-X 8GB DDR3 1600
MSI Radeon HD6970 Twin Frozr III
Thermalright Venemous-X RT
Crucial M4 128GB SATAIII SSD
Corsair CMPSU-850TX 850 Watt


Thank you kindly for any help.
post #2 of 9
Your bios wont look exactly like this but the features are similar.

http://rog.asus.com/forum/showthread.php?2162-Overclocking-Using-Offset-Mode-for-CPU-Core-Voltage&country=&status=

Its really a whole lot of trial and error with offset. Depends on the base votage for your particular chip. set a low offset then boot into windows, load the cpu and see what it offsets too. Then adjust your voltage accordingly. Not really that simple but the guide should help you.

Bios features explained:

http://rog.asus.com/forum/showthread.php?2787-Maximus-IV-GENE-Z-BIOS-Guide-Overclocking&country=&status=
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by hammerforged View Post

Your bios wont look exactly like this but the features are similar.
http://rog.asus.com/forum/showthread.php?2162-Overclocking-Using-Offset-Mode-for-CPU-Core-Voltage&country=&status=
Its really a whole lot of trial and error with offset. Depends on the base votage for your particular chip. set a low offset then boot into windows, load the cpu and see what it offsets too. Then adjust your voltage accordingly. Not really that simple but the guide should help you.
Bios features explained:
http://rog.asus.com/forum/showthread.php?2787-Maximus-IV-GENE-Z-BIOS-Guide-Overclocking&country=&status=


Ok, so basically what you are saying is that I can set my Vcore control to "Offset" along with the other settings mentioned in the guide, and then boot into windows and see what the new load voltage is with my 4.5GHz overclock. Given that I know what I am stable at 1.31 Volts, if I see anything higher than that under load, I can just use the "-" offset and lower it by however much it went up by from 1.31?
post #4 of 9
Yeah it works very similar to the cpu multiplyer I believe. I would suggest leaving it at 0 and a stock cpu speed then boot and see what your base voltage is during load. Then you should be able to adjust your offset to match your target voltage. Load Line calibration will mess with the voltage some though. Hopefully this is making sense and Im actually explaining this correctly. It been awhile since Ive used an offest.
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post #5 of 9
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Quote:
Originally Posted by hammerforged View Post

Yeah it works very similar to the cpu multiplyer I believe. I would suggest leaving it at 0 and a stock cpu speed then boot and see what your base voltage is during load. Then you should be able to adjust your offset to match your target voltage. Load Line calibration will mess with the voltage some though. Hopefully this is making sense and Im actually explaining this correctly. It been awhile since Ive used an offest.

Wait, does my base voltage really matter? Couldn't I just keep my current overclock and just set my Vcore to "offset" and leave "CPU Offset Voltage" to AUTO for the time being and then boot and check what my load voltage is and if its not 1.31 then modify "CPU Offset Voltage" accordingly???
post #6 of 9
Quote:
Originally Posted by ExGreyFox View Post

Wait, does my base voltage really matter? Couldn't I just keep my current overclock and just set my Vcore to "offset" and leave "CPU Offset Voltage" to AUTO for the time being and then boot and check what my load voltage is and if its not 1.31 then modify "CPU Offset Voltage" accordingly???

If you leave it on auto its going to crank the voltage up to whatever it feels like to maintain a clock speed of 4.5. You need to figure out the base voltage then offset from there while running stock clock speeds. Just start out with a small voltage offset and test it. I think youll start to get the hang of it once you start increasing the votlage more and more. You cant define what the voltage offsets from. It will alway be your particular chips stock voltage plus whatever offest you add too it.
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post #7 of 9
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Quote:
Originally Posted by hammerforged View Post

If you leave it on auto its going to crank the voltage up to whatever it feels like to maintain a clock speed of 4.5. You need to figure out the base voltage then offset from there while running stock clock speeds. Just start out with a small voltage offset and test it. I think youll start to get the hang of it once you start increasing the votlage more and more. You cant define what the voltage offsets from. It will alway be your particular chips stock voltage plus whatever offest you add too it.

Got it, so what I will do is load optimized defaults and go back to my stock speeds. Find out what my Vcore is at load on stock frequency, then bring back my 4.5GHz overclock and set everything as before except this time I will have my Vcore set to offset with an offset voltage that will give me Base Voltage at Stock Load +/- Voffset = 1.31 and enable EIST/SpeedStep?
Edited by ExGreyFox - 9/18/12 at 2:03pm
post #8 of 9
Yeah that sounds about like ya got. Speed stepping should be enabled as a default I would think. Could be wrong. I saw your thread on hardforum as well. It seems like all the info is matching up pretty good.
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post #9 of 9
Thread Starter 
Quote:
Originally Posted by hammerforged View Post

Yeah that sounds about like ya got. Speed stepping should be enabled as a default I would think. Could be wrong. I saw your thread on hardforum as well. It seems like all the info is matching up pretty good.

Yeah I'm pretty sure SpeedStep gets enabled as default when you load optimized defaults since I see the frequency and voltage drop to 1600MHz on idle. I will give this a whirl this weekend when I get back home.

hammerforged, you have been a tremendous help. Thanks a ton for your time. I will be sure to come back here and let you know how it went smile.gif
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