Trouble setting per core multiplier as shown by Asus JJ - P9X79 Deluxe, 3930k

[Brnjamin]

First off, hi everybody and thanks for participating. My first custom build, OC, and WC setup has gone smoothly and all my thanks belongs to you guys in the enthusiast community who ask and answer questions on these forums. I will never buy a preconfigured Windows system again that's for sure. So stoked on my new rig.

To business:

Followed J.J.'s x79 instructional video here: http://www.youtube.com/watch?v=Kx2z07sFM2I
Part I'm talking about is at 23:00 in. I have one hot core keeping me from a Prime95 stable 4.8 OC. I want to turn down that core's multiplier.
Am I completely misunderstanding what this is for? So far on a couple other forums I feel like I'm taking crazy pills because people have either never heard of this or say it is impossible. Intel's own site says the turbo ratio is always the same across all cores.

When I try to set per core numbers, whether all the same or different for diff cores - when I boot into Windows my turbo is maxed at 3.6ghz. Weird huh? I found one other guy with this problem online, but no solution. He was using a different Asus board but same CPU.

Thoughts?

Thanks again.

My rig:
i7 3930k | Asus p9x79 Deluxe | 32gb Mushkin Redline 1866 Quad kit | EVGA GTX 670 4gb sc | Samsung 830 256gb | 2 x 2tb Barracuda raid 0 | Seasonic X Series 1050w | Win 7 Pro x64 | Lian Li v1200b | Apogee HD block | MCR220XP rad

[Krindor]

I'm quite new to overclocking myself, so I don't know what will happen but you should be able to choose if you want to change all the cores or change them one at a time to different Clocks.
Try to turn of intel speedstep and see what happens this might cause problems as it lower and increases the Clock and as you read on Intel's page this doesn't seem to be supported by intel themself so the speedstep might Think that the clock is at stock instead of 4.8 and i would guess 4.7. But the reason for heat is mostly due to the vcore so turning down the clock on a single cpu wouldn't help that much you'll need to turn down the vcore to produce less heat and vcore is for all cores and can't be chosen seperatly for each core. This is probably why people on other forums Thinks you are on pills.

[Brnjamin]

Thanks Krindor, I'll try disabling speedstep. Weird thing is stock for 3930k is 3.2 - 3.8 turbo so where 3.6 is coming from I have no idea.
Tried tweaking vcore by increments. couldn't find the sweet spot. I've got 5 cores happily bouncing between 66 - 74 degrees at 4.8ghz vcore 1.410 but CPU core 6 hits tjmax, small ffts Prime at about 9 mins in every time.
Core 6 was way hotter then it's buddies under air as well with old cooling setup. Tried turning, remounting, re-TIM-ing -it's not my cooling setup though I plan to add more rad as a possible solution.
Interestingly I pass Intel burn test easily at standard and just barely at high and for daily use I seem to be "stable". For me that means rendering AFX and Premiere projects - lots of Adobe stuff.

[Brnjamin]

HiViz I'll have read that again but seems you're getting close to the heart of my ignorance thanks 🙂
So, given that per core is not what I wish it was - should I just beef up my cooling for my problem child core 6? That's sort of my plan now. I can fit one or two more 120 x 1 rads in my case. Might try Indigo xtreme to see if I can shave a couple more degrees off. Plus I would like the option to add my gtx670 to the water loop eventually so I'm gonna need more rad anyway I believe, based on my research so far.

[Brnjamin]

*added my components to my sig

[HiVizMan]

Turbo cores do not quite work independently from each other. So for example you can not have core number 3 at 44, and cores 1, 2,4,5 and 6 at 48. You can have a single core, normally the #1 core at a higher multiplier than the others, this is what the Intel built in turbo feature does, but that does not mean the # 1 core will be at that frequency all the time when running. Rather it will have that upper limit available when needed, or when the situation allows a single thread to be maxed. That would require there being little or no other demands on the CPU.

Hope that answers what you are asking.

[HiVizMan]

3.6GHz is one of the states built into the Turbo settings by Intel. I seem to recall that 3.6GHz is when two cores are being used.

http://www.intel.com/content/www/us/en/architecture-and-technology/turbo-boost/turbo-boost-technolog...

That link has heaps of stuff that you can read or watch. They have a vid showing how turbo boost actually works.

[Krindor]

Can you post your full build? Either here or in the rig or build post. Here you have different people who know water cooling and they can advice you on what to get.
Speedstep was a pain in the ass for me when I used the stock cooler before getting the water cooling parts so tell me what results you get.

[Brnjamin]

Krindor - **components added to sig 🙂
+ I'm using CM Blademaster fans all around - can only fit two on my rad for push, too bad because push pull with the rad outside the case did net a couple degrees off all cores. I strongly prefer to keep my rads internally, if anyone is wondering.

[Arne_Saknussemm]

Hey there!:) I'm afraid this is a whole while back so can't find the posts but ....for what it's worth I seem to remember a couple of threads on the forum that led me to believe that running per core actually increased power/voltage requirement and eventually temps when compared to by all cores...