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Dynamic Overclocking

post #1 of 11
Thread Starter 
Hey all, first time here. Been reading the forums and tutorials for the past week and decided to try my hand at overclocking. I was able to achieve a decent overclock but I wanted a 24/7 OC and wasn't thrilled about running my machine with a higher static vcore voltage.

There seems to be (surprisingly) little on this site about the subject of dynamic overclocking but I did find this thread:

http://www.overclock.net/intel-cpus/...-i5-750-a.html

After becoming inspired by the results of those there, I achieved a pretty decent result of 3.8GHz on my i5 750. The beauty to the dynamic overclock is that at idle, my vcore voltage is only 1.004 volts with temps around 25-27c and 9-10 watts of power consumption on the CPU. At full load under Prime, it's 1.368 volts and temps not exceeding 68 degrees with 85 watts on the CPU.

The strange thing is that I wasn't able to get the "offset" function in my bios to work. No matter what I chose, I'd fail one stability test or another. I had to set "offset" to AUTO. So basically my bios is scaling the vcore all the time and is how I get a vcore of 1.368. I'd like to use the offset feature to try and achieve a lower vcore and strive for 4GHz comfortably. I can achieve 4GHz now by letting the bios automatically choose the "offset", but at load my vcore is 1.4008 which is a little high. Stable tho, in all the tests I've thrown at it, just as 3.8 is. I've tried LinX, IBT, OCCT, Prime95 small FFT and Blend. Again, as soon as I enter an offset manually, I'll fail on the stress tests.

Any ideas?
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post #2 of 11
You are talking about speedstep, amd has cool n quiet.

what would having the offset do for you?
post #3 of 11
Quote:
Originally Posted by thrasherht View Post
You are talking about speedstep, amd has cool n quiet.

what would having the offset do for you?
This is what the Offset will do for me. http://valid.canardpc.com/show_oc.php?id=1287134


On some boards like my Asus speedstep alone will only scale the multiplier and the voltage remains constant. In order to have full voltage scaling you have to overclock with Offset voltage control. Which sets stock voltage + the offset that you specify.

Using the Offset voltage control shouldn't really effect stability. Only how you overclock. If it takes you 1.368v load voltage to be stable you just need to find the offset voltage that will get you there.
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post #4 of 11
Thread Starter 
Thanks guys for chiming in.

Sizzle, on your OC validation, I'm assuming that vcore of 1.04 is at idle right?

Quote:
Originally Posted by ~sizzzle~ View Post
Using the Offset voltage control shouldn't really effect stability. Only how you overclock. If it takes you 1.368v load voltage to be stable you just need to find the offset voltage that will get you there.
In reading the above, it sounds like you're saying I should try for a stable, static overclock to find my optimum vcore voltage and then work on applying an offset. Correct?

I spent a couple hours last night trying to get to 4GHz with offset and was unable to. I tried various bclk and multiplier combos and no-go. My machine also seems to prefer a higher bclk with a lower multiplier. Kinda strange. Also, seems to run at lower voltage this way under load.

I'm currently at 3.8GHz stable and pretty happy with that, but of course there's a challenge to achieving the 4GHz barrier. I can get it stable if I let the bios choose an offset automatically, but like I said, under load my vcore is 1.4008 running IBT. Kinda high. Is there some other setting in the bios that I have to enable/disable, like LLC? I have my IMC locked at 1.25 but raising it as high as 1.39 doesn't help, nor does lowering it to 1.15. It seems to be that as soon as I enter an offset, the machine gets pissy. Maybe there's a bug in the current bios for my Mobo, I know there was with the previous release but it was supposed to be fixed in the latest version.
Edited by XOMTOR - 1/19/11 at 11:51am
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post #5 of 11
Quote:
Originally Posted by XOMTOR View Post
Thanks guys for chiming in.

Sizzle, on your OC validation, I'm assuming that vcore of 1.04 is at idle right?



In reading the above, it sounds like you're saying I should try for a stable, static overclock to find my optimum vcore voltage and then work on applying an offset. Correct?

I spent a couple hours last night trying to get to 4GHz with offset and was unable to. I tried various bclk and multiplier combos and no-go. My machine also seems to prefer a higher bclk with a lower multiplier. Kinda strange. Also, seems to run at lower voltage this way under load.

I'm currently at 3.8GHz stable and pretty happy with that, but of course there's a challenge to achieving the 4GHz barrier. I can get it stable if I let the bios choose an offset automatically, but like I said, under load my vcore is 1.4008 running IBT. Kinda high. Is there some other setting in the bios that I have to enable/disable, like LLC? I have my IMC locked at 1.25 but raising it as high as 1.39 doesn't help, nor does lowering it to 1.15. It seems to be that as soon as I enter an offset, the machine gets pissy. Maybe there's a bug in the current bios for my Mobo, I know there was with the previous release but it was supposed to be fixed in the latest version.
Yes that 1.04v was at idle.

You should treat it as it's own overclock not try to transfer settings over. I was more just pointing out that you should find that it takes very close to the same load voltage as a normal overclock. You just get there by a little different route.

If you haven't had it at 4.0 with a normal overclock I would suggest doing so first. That way you get a feal for what it takes to get there. Then there won't be much wondering if a problem you are having is coming from the offset voltage control or just a setting that needs dialed in a little better.

That aside. Due to the way that most P55 boards seem to handle LLC, with the load voltage being higher than idle. It is my opinion that you could have a higher chance of running into problems with LLC enabled. What I could see happening is having a load voltage that is stable but a idle voltage that is too low to handle the transitions. On some boards LLC simply gives you less to very little Vdroop aka the voltage doesn't rise under load. If your board handles LLC like that it shouldn't be a problem.

Usually the pissiness () when pushing up to 4.0 comes from the uncore side of things. You didn't list any memory settings other than IMC. Keep an eye on those and actually I suggest cutting down the memory frequency to 2:6 to take some of the stress off. Get stable with the lower memory speed first and then raise it to 2:8 or wherever you want it or can keep stable at. If you're running highbaseclocks you could run into trouble pretty quick with 1333Mhz RAM those Kingstons might handle a little overclocking just don't count on it right out of the box.

4.78 @ near idle http://valid.canardpc.com/show_oc.php?id=1470537
Edited by ~sizzzle~ - 1/19/11 at 4:50pm
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post #6 of 11
Thread Starter 
Thanks again Sizzzle,

I may try for a static OC at 4GHz this weekend when I have more time, but I'm kinda leaning on settling with 3.8GHz; it's still a pretty hefty OC from stock and my machine runs sweet and passes all the tests, games and apps I've thrown at it. At 3.8GHz, my vCore as reported by CPU-z is 1.376 at full load with max temps reaching 78c after 20 runs of IBT. Of course, Prime95 temps are lower by 5-7 degrees. At 4.0GHz, CPU-z reports my vcore as 1.4007 under load which I'd rather not hit. Isn't 1.4v the max for the Core i5, i7? Temps didn't seem outrageous but we're 79-80c after just a few runs of IBT.

BTW, my ram is at 2:6, 9-9-9-24 with a frequency of 1200Mhz so it's underclocked right?

Out of curiosity, I decided to test the difference between 2.66, 3.8 and 4.0Ghz by transcoding the Family Guy Star Wars episode. For the 55 min episode, using HQ mode in MediaCoder (all 4 cores pegged at 100%), I got the following times (min:sec):

8:38 @ 2.66GHz
6:29 @ 3.8GHz
6:09 @ 4.0GHz

So basically a 20 second difference going from 3.8 to 4 GHz. I think I can live with that, especially considering what I discovered next. As a comparison, I transcoded the same file using my graphics card and it took a svelte 2:08. So even with 4 cores running full bore at 4GHz, the CUDA transcode was still significantly faster. I was getting a framerate throughput of 760 fps! Wow. Luckily, my main apps (Photoshop, Premiere Pro CS5 and PowerDirector) are Cuda accelerated.
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post #7 of 11
I dont get it. Why is your vcore so high? Im on a i7 on 1156 and 3.8 only takes 1.256V
Is Vcore on auto?
If so, baddd idea.
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post #8 of 11
Thread Starter 
Yup, vcore is being automatically handled by the bios and is scaled dynamically according to the load on the CPU. For example, the only time my vcore is 1.376v is at full 100% load under IBT (Prime95 it's more like 1.360v).

Unlike a static OC where you manually enter a fixed voltage, my vcore scales down with less use. This means that at idle, I'm at 1.004v, 10watts of power consumption by the CPU and idle temps around 25 degrees. If the CPU is at 45% load, my vcore may be 1.22v. At 65%, could be 1.27v etc.

As long as the vcore doesn't exceed 1.4v, there shouldn't be a problem.
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post #9 of 11
I am also for using eist and Ocing, i just experimented with i5 2500k and asus, so far best results i got using medium settings for LLC (i bet problem is idle speed and low voltage as ~sizzzle~ sad), i didn`t yet do test with LLC disabled... so far i have 100% stable i5 with 4.8Ghz load 1/39-1.4v and 5Ghz with ~1.48v
Also asus tool AI suite II is a bit strange with medium LLC i need to set vcore to 1.28v to get ~/14 @load and to set ~1.18v to get same voltage with LLC at hight??

So yet i am not sure how it work, but so far i am happy with stable OC and eist, c1e, c3, c6 enebled
post #10 of 11
79C - 80C @ 1.4v is a great load temp for the voltage. Sounds like you have a nice cool running CPU. Get it out of auto and start looking at stable load voltages and temps. On both my i5 and i7 I've found that they very much have sweet spots to them. For my 930 it is 3.8, and for my i5 it is 4.0. In both cases it is alot easier to get stable in that sweet spot, temps are great and the voltage isn't much higher than if I ran 200Mhz slower. Try to push up out of that sweet spot and I have to make a pretty big jump in vcore and temps start getting harder to keep down. You might find that a almost 5 1/2% increase in performance is worth having if it isn't taking much extra voltage and temps. You won't know until you get it out of auto and try. It might suprise you and give you a ridiculous sweet spot at 4.0 like my 760. Or maybe you'll find that it takes you 1.32v to get stable at 3.8 but can get 4.2 stable with only .04v more vcore.
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