Disabling CPU EIST impact ??

[finndrummer]

what will be the impact of disabling this feature as my system can only work stable 100% if i disable it.
am talking about the impact on power consumption and cpu life at the long run.

 

[NdMk2o1o]

what will be the impact of disabling this feature as my system can only work stable 100% if i disable it.
am talking about the impact on power consumption and cpu life at the long run.

Well to be honest when I have had intel CPU's I always disabled it, as long as your not putting crazy volts through it then you need not worry about the lifespan, also with regards to power consumption it will use more when disabled but to be honest your cpu will probably not be running at 100% load constantly anyway (in which case eist would disable anyway) so the power consumption wont be that dramatic. My oc is 24/7 no power saving features, though a lot of the time I am just browsing and listening to music so its not like its using up tons of electricity as it is.

 

[Scheich]

Your Psu is wasting close to 150 W (20%) and you are thinking about savings.. Intels power saving only works somehow if the pc is completly idle (i think), even then its pretty small and of course it will crash any overclocking.

 

[p_o_s_pc]

Your Psu is wasting close to 150 W (20%) and you are thinking about savings.. Intels power saving only works somehow if the pc is completly idle (i think), even then its pretty small and of course it will crash any overclocking.

not true all the time. I run my i7 with EIST ON and am overclocked to 3.9ghz@1.26v when idle it drops the speed down to 1.6ghz and voltage to 1.1(IIRC) and have yet to have a problem.

In terms of diabling it most people do it because of overclocking and it doesn't really have any harmful effects on anything other then heat output and power consumption maybe alittle higher but only a small amount.

 

[finndrummer]

Your Psu is wasting close to 150 W (20%) and you are thinking about savings.. Intels power saving only works somehow if the pc is completly idle (i think), even then its pretty small and of course it will crash any overclocking.

don't know which 150 W you are talking about.

am running at stock speeds and with eist off my multiplier hits always it's max "x24" which is normally the one when one or two cores are active. is it safe to run it like this all the time ?

 

[p_o_s_pc]

don't know which 150 W you are talking about.

am running at stock speeds and with eist off my multiplier hits always it's max "x24" which is normally the one when one or two cores are active. is it safe to run it like this all the time ?

Simple answer is yes.
Its not any worse on it then overclocking it or look at it like this. If it wasn't safe would Intel have let it do that? I'm sure if it would be a problem Intel wouldn't let that happen because they need to protect there rep and make all the money they can.(make less money because of RMA's if it did harm the CPU)

 

[finndrummer]

thanks for the replys man, i think i will just overclock it to 3.6 and work with x20 multplier (180*20).

 

[Mr McC]

thanks for the replys man, i think i will just overclock it to 3.6 and work with x20 multplier (180*20).

Why don't you turn it off, reach a stable overclock and then try turning it on to see if things remain stable?

 

[p_o_s_pc]

thanks for the replys man, i think i will just overclock it to 3.6 and work with x20 multplier (180*20).

good luck. Just a word of advice. I have often read of people having better luck using odd multipliers like 17,19,21,23,etc i haven't had problems using any multiplier i wanted so maybe it was just for older BIOS that had the problem

 

[finndrummer]

just to have higher bclk.

 

[p_o_s_pc]

just to have higher bclk.

From what i have found there isn't much benefits other then slightly higher RAM performance because of the bclk and QPI link.

Wow this stuff can get confusing.I was doing this -> when i took a look at the BIOS and first started learning how to overclock this architecture way confusing when coming from AMD's AII (PII) that was basicly the same as the PI and the PI was only alittle different then the Athlon's. sorry for the rant

 

[finndrummer]

me too, it was confusing the first time and really actually i just know the basic settings and i use a light overclock. i just let the options to "auto" but the inconvenient is they put high voltages in this case.

Why don't you turn it off, reach a stable overclock and then try turning it on to see if things remain stable?

overclock is already stable at 3.6 but with eist on i have always some freezes problems.

 

[p_o_s_pc]

me too, it was confusing the first time and really actually i just know the basic settings and i use a light overclock. i just let the options to "auto" but the inconvenient is they put high voltages in this case.

overclock is already stable at 3.6 but with eist on i have always some freezes problems.

It has been said to never leave voltage's on auto and to set them yourself. Try setting them to the lowest setting you can and stress test. Thats what i did because when i left things on auto i was getting high over volts on everything so i set everything myself and tested it and adjusted as needed.

 

[INSTG8R]

Can't really speak for the newer sockets. But I have run this Rig with it on from pretty much Day 1 of establishing my OC: I have never had any issues. My clocks and volts drop no problem. Heck I watch it flip back and forth all the time while gaming on my G15 LCD thru Everest.

 

[MohawkAngel]

Don't know but for AMD its called Cool'N'Quiet that adjust in the bios . We also have a program called Asus EPU-4 that slow down everythign else like hdd, fans,optical when not used. That spawn longer life and save lot of energy.

 

[Tatty_Two]

Assuming that the theory of Turbo is the same on an i5 as it is on an i7, disabling EIST will obviously disable Turbo, much of the power saving measures in the Bios are linked to Windows Power saving modes, on the i7 of course, to enable Turbo you must have EIST enabled in Bios and "Performance" set in Windows. Some applications perform better with turbo enabled so 3.6 gig with a 20x multi will run some things slightly slower than 3.6gig using a 21x multi, even though the BClock is higher with 20x, often the multiplier > Clock theory is the reverse of what we knew of in S775.

 

[Sasqui]

This is a good thread!

Didn't know this, but the latest EIST version varies both the frequency (via multiplier I assume?) and the VOLTAGE:

" V3.1 (EIST) is used with the first and second generation of Pentium M processors (Banias and Dothan cores, used in Centrino platforms). With this technology, the CPU varies its frequency (and voltage) between about 40% and 100% of its base frequency in increments of 100 MHz (for Banias core) or 133 MHz (for Dothan core). With this technology, Intel also introduces realtime Level 2 cache capacity variation, further improving power savings. "

(A little dated from Wiki). No doubt if EIST is lowering the voltage on your rig, it's hitting a point of instability. Too bad you can't control one or the other.

To answer your question, of course you are going to use more power. The only way to tell how much is get a wall meter like a Kill-A-Watt.

Lifespan? That's a loaded question with many opinions. Most of all, keep your CPU at decent temps, even under load, and you'll probably run it for a long as it takes you to upgrade to the next best thing.

 

[finndrummer]

Assuming that the theory of Turbo is the same on an i5 as it is on an i7, disabling EIST will obviously disable Turbo, much of the power saving measures in the Bios are linked to Windows Power saving modes, on the i7 of course, to enable Turbo you must have EIST enabled in Bios and "Performance" set in Windows. Some applications perform better with turbo enabled so 3.6 gig with a 20x multi will run some things slightly slower than 3.6gig using a 21x multi, even though the BClock is higher with 20x, often the multiplier > Clock theory is the reverse of what we knew of in S775.

yeah disabling EIST disables also turbo boost. the turbo boost works well with "balanced", when you choose "performance" it"s like you disable EIST and the cpu runs always at his max. and about the applications 3.6Ghz with 21x turboboost will give 4Ghz at full turbo speed so this will need some voltages modifications as it will not be stable.
for me 20x 3.6Ghz runs quicker then reference and give a super boost in games and without boosting the voltages and i just use my pc for gaming/surfing on net i don't care about applications. i have see from reviews that the number of applications that can run slower is small and include some light applications like winzip/winrar cause they can't use many cores simultaneously.

This is a good thread!
To answer your question, of course you are going to use more power. The only way to tell how much is get a wall meter like a Kill-A-Watt.

thanks
the sensors on everest/hwinfo32 don't give the correct cpu consumption ?

 

[Sasqui]

thanks the sensors on everest/hwinfo32 don't give the correct cpu consumption ?

Those are based on board sensors and may be close. Think of "brake horsepower", believe what you see at the wall plug.

 

[Tatty_Two]

yeah disabling EIST disables also turbo boost. the turbo boost works well with "balanced", when you choose "performance" it"s like you disable EIST and the cpu runs always at his max. and about the applications 3.6Ghz with 21x turboboost will give 4Ghz at full turbo speed so this will need some voltages modifications as it will not be stable.
for me 20x 3.6Ghz runs quicker then reference and give a super boost in games and without boosting the voltages and i just use my pc for gaming/surfing on net i don't care about applications. i have see from reviews that the number of applications that can run slower is small and include some light applications like winzip/winrar cause they can't use many cores simultaneously.

Take a look at this......

http://ixbtlabs.com/articles3/cpu/ci7-turbo-ht-p1.html

 

[somebody]

Assuming that the theory of Turbo is the same on an i5 as it is on an i7, disabling EIST will obviously disable Turbo

Disabling EIST disables EIST not Turbo.

It's probably your BIOS that is restricting you to a single non-turbo performance state and likely doesn't disable EIST at all. Of course with only one performance state there are no other states to switch to except sleep states or, if your single performance state is turbo then you might get the benefits of running a higher turbo when some cores are idle. Depends how your set up.

 

[Tatty_Two]

Disabling EIST disables EIST not Turbo.

It's probably your BIOS that is restricting you to a single non-turbo performance state and likely doesn't disable EIST at all. Of course with only one performance state there are no other states to switch to except sleep states or, if your single performance state is turbo then you might get the benefits of running a higher turbo when some cores are idle. Depends how your set up.

You may be right about the board/Bios, but if you are it relates to many boards then because I, and many here (with different boards) cannot acheive turbo without EIST enabled, that includes some boards from Asus, EVGA and other Gigabyte models that I know of, I was not sure if it applied to i5 though, but having done a little research, it seems that most 55 boards from Asus also require EIST enabled, I read this guys thread from Toms's, he states at the bottom he needs EIST enabled, Turbo Boost technology requires reading C states according to Intel's white paper, does EIST not therefore allow it to read the C states? Not an expert on this however I do know that on my board (and many others) turbo will not, never, ever enable without it enabled.

http://www.tomshardware.co.uk/forum/281166-10-eist-turboboost-stuck-high-speed-resuming-sleep

 

[finndrummer]

You may be right about the board/Bios, but if you are it relates to many boards then because I, and many here (with different boards) cannot acheive turbo without EIST enabled, that includes some boards from Asus, EVGA and other Gigabyte models that I know of, I was not sure if it applied to i5 though, but having done a little research, it seems that most 55 boards from Asus also require EIST enabled, I read this guys thread from Toms's, he states at the bottom he needs EIST enabled, Turbo Boost technology requires reading C states according to Intel's white paper, does EIST not therefore allow it to read the C states? Not an expert on this however I do know that on my board (and many others) turbo will not, never, ever enable without it enabled.

http://www.tomshardware.co.uk/forum/281166-10-eist-turboboost-stuck-high-speed-resuming-sleep

and from my experience, eist must be enabled to have turbo boost working. also when i set c states to "auto" it alters turbo boost as it will never reach the x24 multiplier so i have to set it to "on".

 

[somebody]

I'm a little confused Finndrummer, in one post you say

am running at stock speeds and with eist off my multiplier hits always it's max "x24"

in another post you say

and from my experience, eist must be enabled to have turbo boost working.

but if your running a i5-750 then 24x is a turbo bin so turbo boost must be enabled for it to work. If you load all 4 cores with something like Linpack then I doubt you will see 24x but probably something like 21x.


Tatty_One, from what I've personally seen, which isn't that much, I can believe you when saying it works that way with many boards.

Your system specs are an i7-920. The i7-920's non-turbo ratios are 9-20, turbo bins are 21-22. What happens if you set 21 in the BIOS with EIST disabled? If you get 21 then your BIOS has enabled turbo with EIST disabled. You might not see 22x as the BIOS might cap turbo to 21 in this case. Finndrummer, you could try this also, 21x with 4 cores IINM or even just enable 2 cores and select 23x or one core and 24x. I'm not sure if they are the right maximum multi's for the 750 with 4,2 or 1 cores but something like that. They are however turbo bins.

Now I'll try not to be too confusing here, although that might be difficult , but after doing this if you run RealTemp and open the settings window you will likely see that EIST is enabled. WTF. This is because instead of really disabling EIST your BIOS is setting the multiplier then not passing any performance states to the OS so the OS should not try to change the multiplier which is effectively like disabling EIST.

If your BIOS has not locked EIST the box will not be grayed out and you could go ahead and really disable EIST. It will not affect turbo boost but will leave the system at the last multi that was set. If you have that 21x multi running try ticking the "Disable Turbo" box in RealTemp. Then you should see your 21x turbo multi drop to a 20x non-turbo multi. Turbo really has been disabled.

Another thing you could both try is to enable the 20x multi with EIST disabled in the BIOS and then un-check "Turbo Disable" in RealTemp if it's enabled and run a single thread such as SuperPi while keeping everything else generally idle to see if that turbo pops up.

The "i7-Turbo" application that comes with RealTemp is real good at seeing changes in your multipliers ratio.


C-States are not linked to EIST, they are driven by the OS and/or sometimes software. Turbo boost however, is linked to C-States.


IMO if your using a fixed core voltage then your probably not going to notice much difference in the power usage average with EIST enabled or disabled.

 

[finndrummer]

thanks man for the nice reply/lesson , it"s the first time i use realtemp, but i have a remark, all other monitoring apllications gives me that x24 all the time whereas realtemp gives normal multipliers 9x/10x idle, 21x 4 cores and 24x two or one core, it"s like nothing is altered with eist disabled. am using 21x in the bios like you say.