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I7 D0 stepping - How to undervolt/low temp @ idle

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September 30, 2009 6:26:16 PM

I have an intel core i7 D0 stepping @ 3.2 GHz w/ 1.18 v ( stock voltage )

My computer is idle for at least 1/2 the day, like when i'm at school or when i'm sleeping. So i'm just wondering.. how do you make your processor turn off cores when it's idle and undervolt itself when it's idle? Is this possible? Thanks

My idle temps w/ scythe mugen-2 are like 41/40/40/37
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September 30, 2009 6:31:08 PM

With the core i7 it has a feature called speed step that should be under clocking the cpu to some where around 800 MHz. If you download cpu-z, it will be able to show your current GHz/MHz in real time. If you dont see it dropping then you need to go into bios and enable it.
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September 30, 2009 6:55:19 PM

Why not just put it to sleep? That will shut down your power hungry video card as well.
In any event, make sure that CPU enhanced halt (C1E) and CPU speed step (EIST) are enabled in your bios setup. If efficiency is that important, then also go back to stock clock speed.
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September 30, 2009 9:39:17 PM

okay thank you i'll try it out now.

I do put my computer to sleep at night and during school :p  I want to try to save as much electricity money as i can haha
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September 30, 2009 9:49:22 PM

okay i enabled speed step and on cpu-z ... the voltages and core speeds are jumping up and down almost constantly... is that safe?

And also, while in bios, i saw that my DIMM voltage is 1.50V @ 9-9-9-24 1333 overclocked to 1600 ... is that safe? lol
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September 30, 2009 9:59:34 PM

jchan said:
okay i enabled speed step and on cpu-z ... the voltages and core speeds are jumping up and down almost constantly... is that safe?

And also, while in bios, i saw that my DIMM voltage is 1.50V @ 9-9-9-24 1333 overclocked to 1600 ... is that safe? lol


thats what speed step do. adjusts the frequency and volts by demand. So that is nothing to worry about.

Now the ram volts, i do believe it's on the high side.
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September 30, 2009 10:07:47 PM

I remember the package said to run my ram at 1.65v and it's at 1.50 volts... isn't that low? lol
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a b à CPUs
September 30, 2009 10:11:21 PM

Yeah never mind on volts. for some reason i was thinking it was 1.3 volts.
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a b à CPUs
October 1, 2009 12:27:48 AM

jchan said:
I remember the package said to run my ram at 1.65v and it's at 1.50 volts... isn't that low? lol

1.65V is the max you'd want to run. The lower you can run the better.

Also, I have my i7 920 undervolted with EIST and C1E enabled, so at idle it reaches a vcore of only 0.768V :)  I lowered the vcore in the BIOS to just under 1V, but it will almost definitely be different for you.
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October 1, 2009 1:49:19 AM

i have EIST enabled, but i can't find C1E ... is that in the same page at the EIST in the bios ?
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October 1, 2009 1:51:06 AM

It could be called C-states or Enhanced Halt State as well.
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October 1, 2009 2:04:05 AM

ooo enhanced halt state... kk thanks a lot!

I'm actually seeing high 20's idling... so amazing :p  ( for me )
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October 1, 2009 2:12:18 AM

oh wait nevermind... it wasnt enhanced halt state... i prob. saw that somewhere else.

But i did see CxE and the description had C-state lol

But which one are you supposed to be at? It had like auto, disabled, C1, C3, and somethin else
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October 1, 2009 2:13:37 AM

If that option is meant to limit what state you want it to go to, make it C6 or C7. What is the exact name of that BIOS option?
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October 1, 2009 9:28:25 PM

i made it C6

it only says says CxE

The speedstep lowered my temps a lot, but this C6 thing didn't really help but w/e lol
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October 2, 2009 12:51:16 AM

It's only useful if there's no load on the cores. Running a temperature monitoring program polling each core every second or so means they can't stay in the C6 sleep state. I think it would be difficult to measure core temperatures in those deep sleep states.
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October 2, 2009 1:48:09 AM

^ but i heard turning your computer on and off is bad for the parts >.>

They said its bad because if you heat it up then cool it off constantly, it messes the parts up or somethin
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a b à CPUs
October 2, 2009 1:49:58 AM

"They" say alot of things. The "should I turn off or leave it on?" debate has raged for years and never been conclusive.
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October 2, 2009 2:18:09 AM

^ true dat

either way, i put my computer to sleep at night and when i'm at school so i save $$ :p 
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