As mentioned above,

After we determine our oc settings stable after (doesnt matter Prime95,OCCT, Orthos) few hours of stressing, can we enable CIE,CIA2 and EIST ? Any chance of causing instability ?After enabling back do we have to stress it again just to make sure its safe ?

I finally decided to go with 4.1ghz daily @ 1.225v as it's still under stock voltage, (referring to VID, it's 1.2375v). Because on 4.2ghz I have to pump until 1.275v and 0.1ghz doesnt make any significant difference in real life performance. SS attached. The thing is now I wanna know whether enabling all (or either one or two of 'em) is safe for overclocked system.

I got difference answer thru google, overclock.net, extremeoverclocking.com and few other overclocking websites. So might as well open up the discussion to all the oc-ers here. Do you actually enable all the power saving options after you determine your daily overclocked setting system ? What to do and what not to ?

Just to share with you few posts regarding this issue -









Well the last post seems against the idea of enabling the power saving options. What say u guys ?

But..Some motherboards does not allow it..or even if it is allowed..the energy saver seems does not work..But then..when back to stock..it is activated.
But this idea is really good..Its not like most of the time you stress the CPU unless you fold..

EIST works for me without affecting stability (LinX stable), however, C-State tends to make my system unstable(probably because it seems to lower my VCore by 0.01-0.02V)
i like EIST as it lower my vcore and speed while the proc is idling, and that's like 70% of the my comp uptime
so regarding ur question, yes a stress test is required after u enable power saving option, imo

This post has been edited by superpc: Jul 22 2009, 08:26 AM

i thought i already answered your question....



turning on or off EIST in BIOS is pointless since as soon you manually adjust the multiplier and vcore, it is automatically disabled... EIST is controlled by the OS under power options. as for C1E, it shouldnt be a problem, though there are cases stability is compromised when C1E is turned on... my point is, turn them on if u want to... but 1 thing u have to remember, since EIST only runs when AUTO is set in BIOS, it will always be disabled when u manually configure a voltage and multiplier... u can c EIST doing its job by lowering the VCORE in CPU-Z when ur proc is not on load... multiplier goes to C1E... therefore, when you overclock, try NOT to set voltage value to AUTO ... doing so will definitely increase the risk of instability

people said disable all the power saving features will result in higher OC.

sort of true.......coz u do get a little bit higher OC, but not much....just tens of MHz

i suggest it is better to sacrifice a little OC for power saving.

It depends which power saving feature you are talking about. For example, EIST doesn't do any harm to your OC settings because it does not reduce voltages. What it does is reducing the clock speed by changing to a lower multiplier during low consumption. When you run Orthos or other stress test programs, it will automatically bring your clock speed back to maximum and you will still enjoy stability because (again) voltages are not reduced

esit is the 1 manages the vid & c1e is the 1 manages the multiplier drop.....

EIST manages both vcore and multiplier(i.e. lower vcore and multiplier while idling, in my case i have 2ghz at 0.97V at idle)
c1e tries to switch off unused core iirc

Yes you did, but I just want to get everyone's opinion here. The thing is some of the answers clashing with others. Ive searched and getting difference opinions tho. If everything clear up I bet I will be just turning onthe C1E.

Anyway thanks for all of your opinions.

Btw we have difference answer too here, anyone can clarify this ?

This post has been edited by mizivincible: Jul 22 2009, 03:02 PM

EIST = enhanced intel speedstep technology (similar to AMD cool & quiet)
Adjust clock speed & voltage base on application demand in order to optimize for power consumption...

C1E = enhanced halt state
It reduces the clock speed of the CPU by decreasing the clock multiplier down to its minimum value & then reducing the voltage...

+1... this is wat i am trying to tell @@

I think this would help:
http://forums.tweaktown.com/f69/power-savi...-scaling-31664/

i am pretty sure my c-state is off and EIST is lowering my multi instead of bus speed, while if C-state does nothing if it's on except from affecting stability
probably different function according to chipset i guess