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

Forum CPU & Components : CPUs - I7 D0 stepping - How to undervolt/low temp @ idle

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jchan   09-30-2009 at 08:26:16 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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------------------------------ I7 920 @ 3.2 GHz | Cooler Master Scout | XFX 4870 1GB | 640GB WD Caviar Black | EVGA SLI LE X58 Motherboard | Scythe Mugen-2 | G.Skill 6GB @ 1600 9-9-9-24 | Corsair TX750W
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warmon6   09-30-2009 at 08:31:08 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.


Message edited by warmon6 on 09-30-2009 at 08:31:43 PM
Reply to warmon6
Newf   09-30-2009 at 08:55:19 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.

Reply to Newf
jchan   09-30-2009 at 11:39:17 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

------------------------------ I7 920 @ 3.2 GHz | Cooler Master Scout | XFX 4870 1GB | 640GB WD Caviar Black | EVGA SLI LE X58 Motherboard | Scythe Mugen-2 | G.Skill 6GB @ 1600 9-9-9-24 | Corsair TX750W
 Reply to jchan
jchan   09-30-2009 at 11:49:22 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

Message quoted 1 times
------------------------------ I7 920 @ 3.2 GHz | Cooler Master Scout | XFX 4870 1GB | 640GB WD Caviar Black | EVGA SLI LE X58 Motherboard | Scythe Mugen-2 | G.Skill 6GB @ 1600 9-9-9-24 | Corsair TX750W
 Reply to jchan
warmon6   09-30-2009 at 11:59:34 PM

jchan wrote :

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.

Reply to warmon6
jchan   10-01-2009 at 12:07:47 AM

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

Message quoted 1 times
------------------------------ I7 920 @ 3.2 GHz | Cooler Master Scout | XFX 4870 1GB | 640GB WD Caviar Black | EVGA SLI LE X58 Motherboard | Scythe Mugen-2 | G.Skill 6GB @ 1600 9-9-9-24 | Corsair TX750W
 Reply to jchan
warmon6   10-01-2009 at 12:11:21 AM

Yeah never mind on volts. for some reason i was thinking it was 1.3 volts.

Reply to warmon6
randomizer   10-01-2009 at 02:27:48 AM

jchan wrote :

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.

Reply to randomizer
jchan   10-01-2009 at 03:49:19 AM

i have EIST enabled, but i can't find C1E ... is that in the same page at the EIST in the bios ?

------------------------------ I7 920 @ 3.2 GHz | Cooler Master Scout | XFX 4870 1GB | 640GB WD Caviar Black | EVGA SLI LE X58 Motherboard | Scythe Mugen-2 | G.Skill 6GB @ 1600 9-9-9-24 | Corsair TX750W
 Reply to jchan
randomizer   10-01-2009 at 03:51:06 AM

It could be called C-states or Enhanced Halt State as well.

Reply to randomizer
jchan   10-01-2009 at 04:04:05 AM

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

I'm actually seeing high 20's idling... so amazing :P ( for me )

------------------------------ I7 920 @ 3.2 GHz | Cooler Master Scout | XFX 4870 1GB | 640GB WD Caviar Black | EVGA SLI LE X58 Motherboard | Scythe Mugen-2 | G.Skill 6GB @ 1600 9-9-9-24 | Corsair TX750W
 Reply to jchan
jchan   10-01-2009 at 04:12:18 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

------------------------------ I7 920 @ 3.2 GHz | Cooler Master Scout | XFX 4870 1GB | 640GB WD Caviar Black | EVGA SLI LE X58 Motherboard | Scythe Mugen-2 | G.Skill 6GB @ 1600 9-9-9-24 | Corsair TX750W
 Reply to jchan
randomizer   10-01-2009 at 04:13:37 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?

Reply to randomizer
jchan   10-01-2009 at 11:28:25 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

------------------------------ I7 920 @ 3.2 GHz | Cooler Master Scout | XFX 4870 1GB | 640GB WD Caviar Black | EVGA SLI LE X58 Motherboard | Scythe Mugen-2 | G.Skill 6GB @ 1600 9-9-9-24 | Corsair TX750W
 Reply to jchan
randomizer   10-02-2009 at 02:51:16 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.

Reply to randomizer
PsychoSaysDie   10-02-2009 at 03:05:04 AM

jchan wrote :

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




It's called turn off your computer when it's not being used. :lol:

------------------------------ Core I7 920 D0 @ 4.2Ghz
MSI X58 Pro-E
32GB SSD, WD Blacks In R0
Sapphire HD 5870's In XFire
 Reply to PsychoSaysDie
jchan   10-02-2009 at 03:48:09 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

------------------------------ I7 920 @ 3.2 GHz | Cooler Master Scout | XFX 4870 1GB | 640GB WD Caviar Black | EVGA SLI LE X58 Motherboard | Scythe Mugen-2 | G.Skill 6GB @ 1600 9-9-9-24 | Corsair TX750W
 Reply to jchan
randomizer   10-02-2009 at 03:49:58 AM

"They" say alot of things. The "should I turn off or leave it on?" debate has raged for years and never been conclusive.

Reply to randomizer
jchan   10-02-2009 at 04:18:09 AM

^ true dat

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

------------------------------ I7 920 @ 3.2 GHz | Cooler Master Scout | XFX 4870 1GB | 640GB WD Caviar Black | EVGA SLI LE X58 Motherboard | Scythe Mugen-2 | G.Skill 6GB @ 1600 9-9-9-24 | Corsair TX750W
 Reply to jchan
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