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What are SB's voltage limits?

post #1 of 7
Thread Starter 
I'm just sitting with 4.5 now because on auto any higher passes the the 1.3v mark.

Now I'm interested in turning my brain on and doing a bit more work.

However, if 1.3v is SB's voltage limits, I won't bother. So I need to know what this chip can healthily take.
post #2 of 7
i've heard that 1.52 was the max... i wouldn't recommend it though. You can definitley go higher with your volts as long as you have sufficient cooling. My 24/7 vcore is alot higher than yours and my processor has been in use since release date.

Anyways if it dies, as long as there are no aesthetic damages to the circuitry you could just rma it. Within the 3 years of intel's warranty.

edit: no one actually knows what the limit sb voltages are...
Edited by badatgames18 - 3/28/11 at 12:41am
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post #3 of 7
I've heared not to exceed 1.38v but I've seen other people reporting they have been putting more through it.
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post #4 of 7
My answer is dont exceed 1.4 ish unless your keep processor under 55c,

1.45 if you keep it under 45c

1.5 if you keep it under 35c.

Hows that?
post #5 of 7
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post #6 of 7
For air, I'd try to keep it under 75ºC Full load, at around 1.34v-1.36v

I wouldn't go above that on air.
    
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post #7 of 7
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, if you overclocked it, 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, and that cpu's wouldn't degrade if kept within the VID range ! 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 smile.gif 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).

I saw someone recently complaining that his i5 (1156) was degrading, and he needed to increase the vcore from 1.3v to 1.32v. Yet he was fully within the "VID range" for the CPU. But clearly, NOT within the vid for his EXACT CPU.

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.

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.

The only thing that has remained rather constant throughout the years is, the higher the voltage you put through a chip, the better the cooling you need, and the harder you push it, the lower the temperature needs to be kept, if you want to preserve longevity of the CPU.
Edited by Falkentyne - 3/28/11 at 3:09am
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