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how do I get my 2500k to go back to 1.6 at idle after overclocking?

toyota

toyota

Lifer
right now I am at 4.2 with voltage set to 1.230 in BIOS. its perfectly stable in the 5 passes of IBT on maximum setting. 1.225 will blue screen right before IBT on maximum setting finishes so 1.230 is certainly the lowest I can use at 4.2.

now my problem is how do I get the cpu to go back to 1.6 and use lower voltage at idle like it automatically did when running stock clocks?
 
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Just enable the standard Turbo, C1E and EIST features, they are rock solid. You must have those turned off. Turbo works either way. I used it for a long time and just decided to turn the speed step off. I like wasting electrons at 4.7 GHz.
 
turbo does not do what I want it to do. it will use a much higher voltage when hitting 4.2 than is necessary.

also I have those power saving features on and they work fine on stock settings. once I change the multi and voltage though they will no longer drop down at idle.

power usage at idle is not really all that much worse but its such a waste to be idling at 4.2 and 1.230 volts for the 90% of the time its not needed. I guess running it like that 16 hours a day for 3-4 years is not a problem though.
 
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That's odd. When I use turbo, it just turbos up to the multiplier I've set, using the voltages I've set. That you'd get different voltages with turbo enabled compared to without seems strange. Are you switching from a fixed voltage to a dynamic one when you enable those options, or overcompensating for VDroop with turbo on maybe?
 
Looked at the manual for the MB in your sig. Doesn't look like many options for overclocking and voltages. What did you change from the stock that throttled down?
 
You also have to let windows use the balance power profile.
If you use high performance, at least with my setup, it will show my top multi- engaged.
It's just something you might have adjusted and forgot.
 
notty22 said:
You also have to let windows use the balance power profile.
If you use high performance, at least with my setup, it will show my top multi- engaged.
It's just something you might have adjusted and forgot.
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that has no impact on the voltage.


mmaestro said:
That's odd. When I use turbo, it just turbos up to the multiplier I've set, using the voltages I've set. That you'd get different voltages with turbo enabled compared to without seems strange. Are you switching from a fixed voltage to a dynamic one when you enable those options, or overcompensating for VDroop with turbo on maybe?
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again if I change the voltage it will stay at that voltage. if I leave it on auto then it will apply way too much voltage whether I oc using the multi or turbo.

it will also will also freeze up in IBT with turbo at 4.2 even though the voltage is higher at 1.32 when left on auto. its 100% stable having the multi at 4.2 though with me manually using 1.23.

since there is no voltage offset option on the mobo, it will have to use 1.23 the whole time if that is what I set in the bios. power consumption is only up by about 15 watts or so at idle so is having it at 1.23 the whole time a problem?
 
You need speedstep and to lower the voltage your motherboard must support "voltage offset" If it dosent have then then you're gubbed im afraid and can only use speedstep 😛

Leaving it at 1.230 all the time wont matter.
 
so other than losing the power saving features is having the voltage at 1.23 all the time really not an issue then?
 
toyota said:
so other than losing the power saving features is having the voltage at 1.23 all the time really not an issue then?
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Yup, non issue. Voltage isnt high enough to kill it, it wont suck that much extra power being at 1.23 constantly instead of powering down.

I measured my i7 at the wall with different voltages and overall there wasent much difference between 1.0v and 1.3v when it was idling.
 
Don't know how it works on your mobo but if you only want 4.2 all you have to do and I mean really all you have to do is put the multi to 42 and leave everything else on auto. It'll downclock and you'll have like 1.28v at 4.2.
 
Crap Daddy said:
Don't know how it works on your mobo but if you only want 4.2 all you have to do and I mean really all you have to do is put the multi to 42 and leave everything else on auto. It'll downclock and you'll have like 1.28v at 4.2.
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that does not work like that on my mobo. if I change the multi it will no longer downclock. plus my voltage goes over 1.3 at 4.2 when left on auto.
 
toyota said:
power usage at idle is not really all that much worse but its such a waste to be idling at 4.2 and 1.230 volts for the 90% of the time its not needed. I guess running it like that 16 hours a day for 3-4 years is not a problem though.
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You should be able to run it at that setting for the lifetime of the chip (ie. 10 years or at least 2-3 upgrade cycles). I have servers that are rarely ever idle for years on end, and some of the older chips don't have throttling at all, they just run at one speed.

I also have an Athlon64 3400+ that is ~10% overclocked and has been stable since 2004, for what its worth.
 
toyota said:
that does not work like that on my mobo. if I change the multi it will no longer downclock. plus my voltage goes over 1.3 at 4.2 when left on auto.
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Yes, 1.3v is way more voltage than needed for 42x for any Sandy I've tested. 1.3v will take you to 44x stable in most cases.
 
normal desktop voltage is less than 1.000 so it does freak me out a bit that I have to idle at nearly 25% higher voltage just to oc the cpu. if you guys think its okay to do that 16 hours a day for 4-5 years or more with no detrimental impact then I guess that is what I will do.
 
I wouldn't say normal desktop voltage is less than 1.000. I've had more chips running from 1.2v - 1.3v than anything else. Sandy Bridge is from 1.200v - 1.250v, depending on who you talk to. So you aren't 25% over stock, you are 0.050 over stock which is about 4%. Nothing to worry about. Previous generation chips were volted much higher.
 
mrjoltcola said:
I wouldn't say normal desktop voltage is less than 1.000. I've had more chips running from 1.2v - 1.3v than anything else. Sandy Bridge is from 1.200v - 1.250v, depending on who you talk to. So you aren't 25% over stock, you are 0.050 over stock which is about 4%. Nothing to worry about. Previous generation chips were volted much higher.
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yes normal desktop voltage at idle is under 1.000 for me on all stock settings. now its 1.230 at idle so isn't that almost 25% more?
 
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@toyota

To get the voltage to be variable according to load you need to overclock using the dvid method (also known as the offset method).

With gigabyte boards, you need to select "NORMAL" as the vcore setting. When you do so the option for dvid voltage will no longer be greyed out and will become selectable. The actual voltage that is NORMAL is listed usually to the left of the setting.

To increase or decrease voltage, change the offset. + offsets increase the voltage. - offsets decrease it. (An offset looks something like +.03V which means your max allowable voltage has been increased by that amount). This is the only way you can overclock whilst allowing your cpu to regulate its voltage the same way it does when the stock/auto settings are in place. If you manually put in a voltage value, that value will be static at all loads. If you however select normal, and use the dvid offset method, the voltage will drop super low levels when the load is super low and rise to your max voltage at max loads. Its remarkably stable and well implemented on many boards allowing an overclocked chip to retain the same power saving features as a stock chip. My chip for example at idle is around .9v and at max load will rise to about 1.28V with variable voltages in the middle depending on the load.

Also make sure stuff like EIST, c1e, c3/c6 are enabled so that CPU speed will vary with load as well. Speedstep only adjusts the CPU frequency. DVID is what allows the voltage to be variable as well.

I described how it works for gigabyte boards. Asus is similar though a few names may be chaged.
 
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again my board does not have any type of offset mode that I am aware of. and as SLK mentioned, once I change the voltage from auto I will lose power saving features.
 
you cannot select a NORMAL setting? I find it hard to believe MSI would neglect such an obviously useful feature...
 
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Sunburn74 said:
@toyota

To get the voltage to be variable according to load you need to overclock using the dvid method (also known as the offset method).

With gigabyte boards, you need to select "NORMAL" as the vcore setting. When you do so the option for dvid voltage will no longer be greyed out and will become selectable. The actual voltage that is NORMAL is listed usually to the left of the setting.
To increase or decrease voltage, change the offset. + offsets increase the voltage. - offsets decrease it. This is the only way you can overclock whilst allowing your cpu to regulate its voltage the same way it does when the stock/auto settings are in place. If you manually put in a voltage value, that value will be static at all loads. If you however select normal, and use the dvid/auto method, the voltage will drop super low levels when the load is super low and rise to your max voltage at max loads.

Also make sure stuff like EIST, c1e, c3/c6 are enabled so that CPU speed will vary with load as well. Speedstep only adjusts the CPU frequency. DVID is what allows the voltage to be variable as well.
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This.^

I just had my post typed up and Sun beat me to it. 🙂

On my i3. when I manually set voltage to a set value (rather than auto or normal), it no longer drops the voltage at idle -- the vcore always stays at that value. If you want the voltage to drop at idle you have to use auto/normal on vcore. If you want a lower voltage than that then you have to use an offset. The offset on my Gigabyte MB is called Dynamic Vcore (DV). With a set voltage my DV isn't available.

For example, on auto vcore (stock speed) I get …

1.240v … load
0.960 …idle

If I use an DV offset of -0.05 … I get …

1.190v …load
0.910v … idle

… so even on auto/normal, if the vcore is too high for your tastes you can still drop (or raise) it using a DV offset.

I should note that lowering vcore at idle probably doesn't make much difference since the latest CPU's have power gating and idle states. With a set vcore of 1.240v my i3 only idles a few C higher than at 0.960v.
 
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