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V for SB - what is safe?

post #1 of 9
Thread Starter 
Hey.


I know this is a really hot topic, but..

What voltages is safe to run 24/7?

If I google, I get people saying 1.35V max and others saying 1.45V is max.


I'm not planning on having this CPU for years, I even plan on switching to ivy, so.

As you can see in my signature I'm running 5GHz 1.41V. Atm it's fine in bench (2+h)but got BSOD, so I'm still testing.. Anyways I think it will settle on 1.41V or 1.42/3V


Is that fine ?


Also.. It's obviously not 100% stable if it gets BSOD (0x000000124) after 2+ hours.. But is that enough for a 24/7 gaming? Because it was stable at 2+h at 1.39V
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post #2 of 9
What are your temps? If you can keep the temps down you should be fine.
post #3 of 9
i'm running 1.376 Vcore 24/7 @ 4.8ghz
intel rate it for 1.52 Vcore, personly I don't want to take mine anything over 1.4 Vcore for 24/7
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post #4 of 9
Well Intel apparently state the max as 1.53v.

But seems this is a new platform and no-ones really had time to test it out, I'd PERSONALLY go with a max of 1.4v. Especially considering it's 32nm.

1.41v would be fine though, realistically. And seems you won't be keeping it for very long I'd feel fine putting 1.45v through it.
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post #5 of 9
Unfortunately, my findings have found that sandy bridge cpus are just as likely to crash gaming as benching, and if you can last 2 hours prime 95, that doesnt mean you will last 2 hours in TF2 or Assassins Creed.

Personally, I would lower your speed to 4.7-4.8, because thats the only way youre going to be rock stable with only 1.4 volts.

In fact, if your interested in gaming, see if your cpu can last 2 hours in a tf2 16vs 16 bot match. Its very good at causing a bsod 0124.

I thought my 4.6 was a stable at 1.4. Turns out I needed 1.44 to be able to game for 10 hours straight. I was fine a 1-2 hours usually, but who wants to crash when they are about to win the matches mvp award.

If you want to be safe, make sure you are not drawing more than 1.4 gaming, and try not to do a**** ton of 8 hour stress tests.
Edited by Lex Luger - 3/28/11 at 1:58am
post #6 of 9
Thread Starter 
Thanks for the replys.


Temps are 69-76
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post #7 of 9
You're safe up to 1.52v according to Intel. I'd trust them to know their own products .
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post #8 of 9
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post #9 of 9
Gona repost this from another thread I just replied in.

No one knows the maximum voltage because Intel hasn't released any absolute minmum or maximum ratings yet.

All they released is the VID range.
And this causes a completely new problem.

VID (under VRD 12) is calculated in a completely different way than any other Intel CPU in the past. In the past, the VID was created for each CPU, depending on internal testing, and this VID is the default voltage for that individual chip, and it would always run at that voltage if set to auto (except for some manufacturers that would overvolt it for you, usually way too excessively). People errornously thought, that for older chips that had a VID range, of, let's say, 0.850v-1.3625v, that the maximum safe 24/7 voltage for these cpu's was 1.3625v ! That couldn't be farther from the truth! Because the VID is DEPENDENT on each individual CPU ! One CPU might have a VID of 1.25v, another one a VID of 1.15v, and a third a VID of 1.3v! (This is one reason why Intel released the min and max ratings). However, it was pretty safe to say that if you ran a CPU within the vid range, that at least you wouldn't destroy it But the maximum VID allowed for that particular VRD specification at the time was 1.3625v. (I'm directly referring to Core 2 Wolfs/Yorks, here, as I don't remember the min and max vid for the 45nm core i7's, but I think it was similar).


Now, for SB, instead of a fixed VID for default frequency only, VID is calibrated per each CPU, and adjusted for each multiplier on the CPU. It's done such that two identical CPU's of two identical batches may have two completely different VID ranges.

The lower the default VID of the CPU, the better the chance that it will be a good clocker. Lower VID chips may be leaky (give off more heat), but a "side effect" of being leaky is them being more responsive to voltage changes.

The maximum possible VID that a CPU can be given automatically, depending on the multiplier speed, is 1.52v. This does NOT mean that the CPU can be run at a maximum of 1.52v !! This only means that this is the absolute maximum VID possible for a CPU under VRD 12 (and of course you can exceed this voltage manually). And I'll say it again--the VID is calibrated during manufacturing and can not be changed. So just because that is the maximum VID for the chips, does not even mean that any currently available CPU will even have that vid set into it.

The VID can also be adjusted for load levels, as well (though this adjustment is usually very slight).

The VID is apparently calibrated in such a way that the CPU (at least at manufacturing time) will be able to successfully complete Power On Self Tests at the current speed. So a cpu running at 5200 mhz and a VID of 1.395v, will be able to complete POST at 1.395v. That doesn't mean it will be able to run stable at all.

(just to show you how far off this could be realistically, a CPU that has a VID of 1.3215v @ 4 ghz, might run fully LinX/Prime stable with a load voltage of 1.18v). The VID is ideally set for fully supported voltages and frequency ranges, so, in this case, 3400-3800 mhz. And the CPU's are supposed to be able to run FULLY stable, up to their Tjunction Max temperature, with that vcore being applied, at hellish temperatures (as long as kept below TJmax). That's how the cpu's are tested. They aren't tested at 4.5 ghz or 5 ghz or whatever. But the VID calibration (since that is what is happening) is supposed to let the cpu's to be able to start up at the VID it requests. But as far as "official" stable settings, then only 3400-3800 mhz means anything.

The highest VID I saw for any CPU that I've used is 1.395v @ x52, so far.

And, No, the CPU's are NOT tested in motherboards to determine the VID that will be burned into the silicon. It's done at the plant, with specialized hardware, and then the VID signal is implanted into the cpu's, so stuff like dealing with motherboards and LLC do not apply here.
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