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Help with offset vcore, 2700K w/ Maximus V Gene, 5Ghz

post #1 of 20
Thread Starter 
Evening,

i've been testing with manual vcore thus far, to determine the vcore needed for 5Ghz. 1.464v is where i landed, which suggests a pretty lousy chip (even 1.5v was not enough with HT on, so HT´s been turned off now). @1.464v temps were under 70C in a 16-hour prime95 run. However, i´d like to have speedstep and c1e on for some highly valued green OC, and that´s where offset voltage comes in.

Putting on offset voltage and setting it on auto sends this chip into 1.56v, which is not a figure i want to see (without some serious cooling). So i figured i would need to set the offset value to -0.1v, to get roughly 1.464v under load and luckily still maintain it stable on idle as well... the Maximus V Gene immediately didn´t like my plan, showing -0.1v in red, so i tried something a little less red first, -0.06, but couldn´t even boot to windows with these settings...

So, what i´m wondering now is, is it even possible to get 5Ghz using offset and speedstep under these circumstances (the 2700 wanting 1.56v on auto, and 1.464v being the target), or is there something i´ve misunderstood in using the offset voltage.
post #2 of 20
Thread Starter 
Ok, some more testing revealed the + offset doesn´t add to the max voltage seen on auto, like i thought. That was what i was missing, in case anyone comes here with the same problem. So i had to put +0.1 to the offset to get 1.46 vcore.

I read the OC guide by Sin0822 here (which was awesome btw, like the ivy OC guide as well), in which he said that 1.5v is what he recommends as max vcore for 24/7, so i´m assuming 1.46v will be fine. What sort of voltages are people using with their 2600K or 2700K here? I´d like the input on that

Thanks
post #3 of 20
Quote:
Originally Posted by W.A View Post

Ok, some more testing revealed the + offset doesn´t add to the max voltage seen on auto, like i thought. That was what i was missing, in case anyone comes here with the same problem. So i had to put +0.1 to the offset to get 1.46 vcore.
I read the OC guide by Sin0822 here (which was awesome btw, like the ivy OC guide as well), in which he said that 1.5v is what he recommends as max vcore for 24/7, so i´m assuming 1.46v will be fine. What sort of voltages are people using with their 2600K or 2700K here? I´d like the input on that
Thanks

You can try to find it for yourself, using the "search" bar above on this forum. Right under the "Home, Forums, Reviews", etc... buttons is the white search field.

As for your question: I have my 2600K stable at 1.395V for 4.6GHz (manual, cause I don't understand that offset mode tongue.gif)
With these settings I'm 12h stable on Prime staying under 80°C (air cooler)

But I'm able to play games (so not stress testing) at 5GHz at 1.5V...
   
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post #4 of 20
Quote:
Originally Posted by W.A View Post

What sort of voltages are people using with their 2600K or 2700K here? I´d like the input on that
Thanks
For 5GHz, 1.35V with LLC (on ultra-high if I remember correctly) is all my 2700K needs. I guess my chip is somewhat good ^^
post #5 of 20
Thread Starter 
Quote:
Originally Posted by TkGlitch View Post

For 5GHz, 1.35V with LLC (on ultra-high if I remember correctly) is all my 2700K needs. I guess my chip is somewhat good ^^

I read somewhere that the average for 5Ghz (2700K) is well above 1.45V, closer to 1.5V... so you have a great chip. I have a lousy one, but i guess it´s karma or something, since my i7 950 went up to 4.6Ghz on air, which was pretty rare for 950.

Btw, i had a BSoD while i was in the portal 2 editor (even though i did 10h prime with the same settings, but manual voltage), I´m now wondering whether using the offset voltage is more unstable than using manual voltage because of speedstep, even if you have the same amount of voltage on load. I added +0.01V to the offset value, i guess time will tell...
post #6 of 20
The VID drifting effect can lead to issues when using offset mode :
Quote:
Originally Posted by ugotd8 View Post

Offset mode & BSOD 124 can be the most difficult OC issue to track down.
It was confirmed by Raja over at the ROG forum that there is a phenomena (for lack of a better word) of VID drift. What does that mean you ask ?
First off, I'm sure you know, but the VID is used by the mobo to calculate voltage (along with LLC).
Well, let's say you get stable at a certain voltage offset. then power off the machine and turn it back on tomorrow. Now you are not stable. Well the VID that the mobo read from the CPU is lower than during the time you were OC'ing yesterday and getting all those BSODs.
So, the key to me when OCing using offset turned out to be after power-on I'd go into BIOS and look at the voltage listed on the AI Tweaker page next to my offset field. If it read 1.192V, I knew my .035 offset was not going to be stable if I fired up prime. Sure enough, BSOD 124. Then back into BIOS after a reset (but not a power-cycle) and surprise, the voltage listed on that same page now reads 1.204V !!! So, I'd hit escape, exit without saving changes, back into windows and yeah, stable. I still don't understand how this happens but it does. Yet another thing that makes offset mode difficult to use.

So make sure to check the voltage you get when rebooting !
post #7 of 20
You must check stability using 1 thread in prime if you're using offsets with c3 and c6 enabled. You also can not use any LLC in this scenario. It's not possible to get it 100% stable unless you severely overvolt during 8-thread loads.

If you have c3 and c6 disabled and still crashing in light loads, then you're using too high LLC. The higher your LLC, the less voltage you receive during workloads that are less demanding than prime (or whatever software you used to verify your overclock.) This is easy to witness for yourself if you pay attention to volts while using any other software that puts a constant load on the CPU. I like to stabilize with prime, then check volts in Handbrake/FaH/WCG and verify the drop isn't too severe. Some droppage is normal and perfectly safe and is one of the advantages of using offsets. Frankly, if you're using 3/5 LLC or less (50% or less for my board), you won't have this issue.

In other words, I have never gotten an offset overclock 100% stable using 4/5 or 5/5 LLC without overvolting for prime loads.

Also, getting an offset overclock stable with c3 and c6 enabled has huge power saving advantages in gaming and any other 1-3 thread loads. The highest voltage I can do it with my board is 1.34 prime volts (again with 0% LLC).

EDIT: I forgot to mention speedstep. Speedstep adds another dimension to the light-loading stability that I just don't bother with. I always disable it. (Using speedstep with offsets raises the voltage requirement for light loads.) I have a kill-a-watt for my system and I've never found a benefit using it. Several workloads are faster with it disabled anyhow, such as x264.

EDIT2: One last thing, lowering PLL kills offset overclocks because it also raises the voltage requirement for light loads. The higher the PLL, the less volts required for 1-thread loads. Again, if c3 and c6 is disabled, this is not an issue.
Edited by Iketh - 5/22/12 at 5:48pm
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post #8 of 20
Thread Starter 
Thanks guys, this is A-class information. I´ve been having instability issues while booting recently (automatic restart, freeze on windows logo) and thought that was strange. But from what i gathered now from all this info, it´s either because of this VID drifting, or having too much LLC (75% LLC with c3/c6 disabled, c1e and speedstep enabled). I put it to 75% because that´s what i saw recommended on the ROG forum, but i´ll start trying to lower it now, if i keep having random boot failures. I haven´t had any BSoDs on light workloads, that is, if i can get to windows first. If all else fails, back to good old manual vcore...
post #9 of 20
c1e doesn't matter for stability... leave it enabled... and c3 c6 are supposed to be disabled unless you use 0% llc
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post #10 of 20
Quote:
Originally Posted by W.A View Post

Ok, some more testing revealed the + offset doesn´t add to the max voltage seen on auto, like i thought. That was what i was missing, in case anyone comes here with the same problem. So i had to put +0.1 to the offset to get 1.46 vcore.

I read the OC guide by Sin0822 here (which was awesome btw, like the ivy OC guide as well), in which he said that 1.5v is what he recommends as max vcore for 24/7, so i´m assuming 1.46v will be fine. What sort of voltages are people using with their 2600K or 2700K here? I´d like the input on that

Thanks

I'm having exactly the same problem here with my 2700k. Are you saying the + offset lowers the voltage rather than the -? I can't figure out what's going on.
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