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Is it possible to set a MAXIMUM voltage or voltage variance range?

post #1 of 6
11/12/12 at 12:34pm
Thread Starter 
Hey guys, got an overclocking question and am not sure where to put it. Mods feel free to move this to wherever.

Anyway, I am noticing that its become OK to let your CPU handle its own voltages, that way it can adjust during idle states, as well as adjust more during load so that it stays more stable. My question is: is there a way to set a MAXIMUM voltage or maximum voltage variance for an auto?

That is to say, can I make it so that the proc does not go above, lets say, 1.35v during its auto adjustments? Or set a range of voltages that is acceptable for the CPU to handle itself? Ideally setting the minimum extremely low, and capping the top at a certain number?

The reason I ask this is that I feel my processor would be able to have a lower maximum voltage than the one the auto adjustment puts it to, meaning a lower temperature and thus a higher possible OC with lower voltage. However, I like the fact that the voltage and clocks can drop during idle, thus squeezing even more life and stability out of my rig for a longer period of time.

Basically, I like the auto adjusting voltage, but am wondering if I can put stipulations on its ability to auto adjust.

Motherboard is a GIGABYTE z77X-UD3H, if anyone knows anything about these features in the UEFI.

Thanks a lot guys!
Edited by kmac20 - 11/12/12 at 12:37pm
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post #2 of 6
11/12/12 at 2:06pm
I think what you want is an offset voltage. That lets you set what the load voltage would be, based on your offset, but also lets the chip downvolt when it is not at full load. That way it works like Auto, except you set the maximum load voltage. The only other way to do what you want would be to set a fixed voltage, and then the chip will maintain that all the time with no downclocking - so not really what you are looking for. There is no way that I'm aware of to limit the range of Auto Vcore.

If you want to set up an offset voltage, the best method is to first figure out the desired load voltage using a fixed voltage. Then, once you get a good stable clockspeed and voltage, switch over to offset. The way offset works is to add whatever value you put in to the voltage the chip is requesting at that speed (the Vid). So if you need 1.35V for stable operations, and the Vid at that freq is 1.325, then your offset would be +0.025.

There are two ways of figuring the offset - you can either get the Vid from RealTemp under load, or you can just guess at an offset (say +0.005) and then compare what that gives you under load to what you need and adjust accordingly. I prefer the second method, since you are probably going to have to iterate the offset anyway to get it just right, and that way takes LLC into account automatically. But either way works.
Edited by Forceman - 11/12/12 at 2:20pm
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post #3 of 6
11/12/12 at 2:11pm
just set your vcore and enable intel speedstep..
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post #4 of 6
11/12/12 at 2:15pm
Quote:
Originally Posted by runeazn View Post

just set your vcore and enable intel speedstep..

If you use a manual voltage, then it won't downvolt at idle. It'll still downclock, but not reduce the voltage. You do still get lower power draw at idle that way, if that's what you are looking for.

Good point though - OP you'll still need to enable at least EIST and C1E even if you use offset (and you can try C3 and C6 as well - though they sometimes cause problems with offset).
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post #5 of 6
11/13/12 at 12:20pm
Thread Starter 
I already have enabled those. Which is weird because i'm so used to overclocking a C2D, and it was pretty acceptable to leave those off permanently.

You also get EXACTLY what I mean, and my reasoning behind this all, so thanks for input.

If it reduces draw regardless of voltage going up/down, then i'm good to go with manual voltage regardless. Thanks for letting me know about all that stuff! I definitely need to do some reading up on voltage offsets then, as I kinda get what you mean, but am confused a bit to the exact specifics of exactly how this will function and aid me. I get what you're saying, I get the definition of offset, but I"m having a hard time wrapping my head around its benefits to me at this time, especially considering.

Thanks again dude. Maybe you could PM me some more info regarding offsets? Some good links discussing it and mapping it all out for me, so I can weigh the dis/advantages? Even if not, you've already given me something to look into, so thanks again.
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post #6 of 6
11/13/12 at 3:22pm
I'll see if I can find any good guides - there's lots of stuff avilable, but it is mostly spread around in different articles and threads.

As for advantages/disadvantages, the main advantage is that you can lower the voltage going to the chip when it is idling and so extend the life of the chip (although realistically, for the normal voltage range, probably not enough to matter). The only real disadvantages are that it takes more time to get the offset dialed in correctly (usually a couple of iterations of setting and checking), and it takes longer to test stability, because you can get instability at idle or low-load situations that you'll need to check for.

I originally left mine on manual for a while, and then when I got the urge to tinker/upgrade (which happens a lot) I messed around with offset. Helped me scratch that itch without spending more money. wink.gif

Edit: I did find these guides - both of which kind of hit on offset overclocking:
http://forum.overclock3d.net/showthread.php?t=38867
http://club.myce.com/f184/easy-overclocking-guide-intel-sandy-bridge-ivy-bridge-cpus-329214/
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