Help Overclocking the Corei5 2500k

[avatar82]

also noticed another issue. Coretemp reports that my VID voltage is 1.226V or something close. Previously before my OC, it was about 0.9V?! and now its a constant 1.226V. what did i do?! For some reason, cpu-z reports that i'm idling at 3.3Ghz now and i no longer idle at 1.6ghz. FML. I think i effed something up. Please help!!

no you didn't "eff" anything up

the idle voltage and multiplier drop you saw previously was both c1e and eist you had enabled in the bios. unfortunitly some bios's on some motherboards disable both these feature when overclocking even when they say enabled in the bios. there isn't anything you can do about it unfortunitly that i know of

they should have re-enabled when you set everything back to auto, or normal

personally i don't understand why there is both c1e AND eist, i know c1e works on the hardware level and is os independant, and eist requires os support (therefore software beyond the bios), but i've found that eist ups vcore and multiplier if you just shake your mouse around on the desktop
and c1e seems to know that just moving the mouse around doesn't requre any attention. and when you put a load on the cpu like a game or prime95 or whatever, they both raise you to max, so again whats the point of both, when c1e seems to work better/if not as good as eist

 

[BonzaiDuck]

no you didn't "eff" anything up

the idle voltage and multiplier drop you saw previously was both c1e and eist you had enabled in the bios. unfortunitly some bios's on some motherboards disable both these feature when overclocking even when they say enabled in the bios. there isn't anything you can do about it unfortunitly that i know of

they should have re-enabled when you set everything back to auto, or normal

personally i don't understand why there is both c1e AND eist, i know c1e works on the hardware level and is os independant, and eist requires os support (therefore software beyond the bios), but i've found that eist ups vcore and multiplier if you just shake your mouse around on the desktop
and c1e seems to know that just moving the mouse around doesn't requre any attention. and when you put a load on the cpu like a game or prime95 or whatever, they both raise you to max, so again whats the point of both, when c1e seems to work better/if not as good as eist

My understanding was that C1E performs the throttling when the spec throttle-temperature is reached (72.6C for i7-2600K -- probably the same for all "K" CPUs). EIST just drops the multiplier and voltage at idle so idle speed in Mhz is cut by half.

 

[avatar82]

hmm well that would make sense if they are infact more different then i thought, i'll have to take another look when i get home from work. i could be remembering wrong or i could have been fooled by my motherboard when i played with that stuff last.

thanks for the response!

 

[Crap Daddy]

Hey handsome, stop messing around with stuff you don't understand. As some people mentioned here already put the damn multiplier to 4.2 or whatever you want until 4.4 and leave everything else on auto! This thing is so smart that it will take care of whatever you need in terms of performance. When you surf the net you'll have some low clocks, when you play Duke Nukem you'll get other clocks and when you encode some blockbuster for your iPod you'll get the highest possible performance. All you have to do is check your temps under load. Would be very good to keep them around 60C. The max temp is 98C so no, it won't throttle at 75 and neither at 85C.

 

[BonzaiDuck]

hmm well that would make sense if they are infact more different then i thought, i'll have to take another look when i get home from work. i could be remembering wrong or i could have been fooled by my motherboard when i played with that stuff last.

thanks for the response!

I may be somewhat off with that -- about C1E. It drops ("droops") voltage in an idle state, and seems causative for vdroop under load. Supposedly it "helps" the TM or thermal management function that actually DOES the throttling at the thermal spec.

With previous OC'ing, I'd simply turned EIST and C1E off. At some time, I tried leaving EIST on. IF I let the system go into a sleep state, it would return to show RAM latencies incorrectly. I just left all that stuff off.

Now with these new motherboards, you can get stable over-clocks all the while leaving those things enabled. But to fully understand how to tweak those over-clocks, it would be a good idea to become more familiar with those features.

EDIT: I've got some reading to do; Here's some reading to do . . . Follow the links to the INtel et al sites:

http://www.wireboom.com/threads/727...6-EIST-Speedstep-Turbo-Boost-and-Core-parking

 

[handsome_dave]

Wow! So many helpful responses

Crap Daddy: Thats the thing though, I'd like to understand what all this stuff means. Afterall, all the guru's in this form will have to train us noobies so we can help out future generations

I've OC'd my cpu to 4.0 Ghz (which runs 24/7) but I think I rather keep EIST on so that my cpu will idle at 1.6Ghz and when i need the extra muscle, boost to 4.2Ghz. Please correct me if i'm wrong but my understanding is that i will have to change the core ratios to: 42,42,42,42 for core ratio 1,2,3,4. This will ensure that no matter how many cores are active, i'll consistently get 4.2Ghz. But what about the multiplier? if i leave that at x33, will my cpu use 3.3Ghz under normal use? Will i have to play around with the power limits?