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  i7 2600k Overclocking with EIST/SpeedStep 
 Date Written 
Jack Fox Sep 18, 2012, 03:55pm EDT Report Abuse
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
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.

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BoT Sep 24, 2012, 07:41pm EDT Report Abuse
>> Re: i7 2600k Overclocking with EIST/SpeedStep
the offset is the voltage that is either added or subtracted from Vcore.
so if you Vcore is 1.250v and you offset is +0.125v then you would end up with 1.375v

the Vdrop is an undesired negative variation from Vcore.
if you set Vcore to 1.250v with offset of +0.125 and end up with 1.375v in bios but if you actually measure the voltage on the motherboard or maybe even software your voltage might be more like 1.364v. so the difference of what you set in bios as your Vcore (1.375v) and what you actually measure in software or on the board (1.364v) is what is called Vdrop.

usually when and if you introduce power saving features like EIST etc your peak overclock will drop. with the large fluctuation also comes more instability. so you might have to drill back a bit. not necessarily but possible.

your offset most likely will look more something like this [0.0125v]

You can either be part of the problem or be part of the solution.
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