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Did we ever come a conclusion on safe SB voltages?

post #1 of 93
Thread Starter 
Forgive me if there are other posts like this. I tried searching, but I kept finding page after page of results from Jan-Feb where people were just speculating.

Having read the Intel data sheet, I know, for a fact, that the max VID for SB is 1.52V.

I've also seen the other numbers, like 1.38, or 1.4, or everything, and I have seen absolutely no proof that they are the case.

I've also read the list in the Sandy Stable club, and the voltage comment there.

My question: have we seen any degradation due to voltages at or under 1.52V with SB in the 10 months or so since it was released?

My goal is to run my 2600k at 5GHz with around 1.45V on water (I'm currently Priming right now to see if its stable). I just want to see if anyone has had any personal experience with voltages at this level.
post #2 of 93
I think Intel caps it at 1.4...1.5 would be great for a 65nm+ chip.
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post #3 of 93
Thread Starter 
Quote:
Originally Posted by Amdkillsintel View Post
I think Intel caps it at 1.4...1.5 would be great for a 65nm+ chip.


This is the whole point of my question. Speculation is useless, and spreads misinformation. The only hard number I have ever seen is the one in the Intel data sheet. Where does Intel "cap" it at 1.4?
post #4 of 93
Based on what I have seen in the Sandy Stable club, no one has really seen any degradation, even all the way up to 1.488V.


Quote:
Originally Posted by Amdkillsintel View Post
I think Intel caps it at 1.4...1.5 would be great for a 65nm+ chip.
We are talking about Sandy Bridge CPUs.
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post #5 of 93
i been searching myself and only find stuff back in feb through march was wondering cause trying to get my cpu stable at 5ghz but it needs a smidge over 1.48 lol
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post #6 of 93
I know what I'm about to question doesn't give a specific answer, but I think few here will have more than speculation.

What if that 1.52V number is speculation itself. Sure, the number is printed, but that number is meaningless unless we know everything about it, not just seeing "VID" and assuming "hey, it's the maximum safe voltage regardless of other variables". Not only that, but the notes themselves say it can vary from CPU to CPU; that they can have their own range. Under what conditions is that 1.52V number okay? I'm sure the lower end listed (0.25V) wouldn't be possible across the board either, so... I'd exercise some caution. That 1.52V number might not mean it would be okay at that voltage at high frequencies/temperatures/load level for too long.

I found this from another thread...
Quote:
Originally Posted by Ishinomori View Post
Intel has a new system to make overclocking easier, where everything is set to auto and the CPU "selects" a voltage from the "VID Table" (side note: im begining to believe VID stands for Voltage Identifier), based upon what multiplier is chosen, each VID Table is individually programmed for each CPU, Vdroop is as "Wumpus" stated, when the Amperage increases, the safe voltage is reduced, so the CPU needs to reduce the voltage to stay within safe limits.

While 1.52v might be safe at idle, it is most likely not safe under heavy load at higher frequencies (increased amperage) so it droops to 1.4v.

This is all speculation on my part [based on many hours of research i have done into overclocking sandybridge] as i have no firsthand knowledge.
The feedback from those using as much, or more, might be a little telling, but it's been just under ten months. How many have been running them that way the whole time with no side effects?

I mean, if someone would prove me wrong about my doubts on the 1.52V number, go ahead. I'm going to be moving to a 32nm Core i5 soon, and I'd love for that to be the limit, but I'm on a 45nm Core 2 with a limit of 1.3625V (if I remember right), so forgive me for being a bit hesitant of it.
post #7 of 93
1.3625V isn't the limit, though. It's 1.45V. That's why I'm wondering if 1.52V is not actually the limit for Sandy Bridge.
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post #8 of 93
Quote:
Originally Posted by TwoCables View Post
1.3625V isn't the limit, though. It's 1.45V. That's why I'm wondering if 1.52V is not actually the limit for Sandy Bridge.
Where is 1.45V listed as the limit? I recall the 1.3625V being thrown around, and people generally accepted up to 1.4V, or sometimes 1.45V, but I don't recall Intel ever listing those numbers. Again, I could be wrong here.
post #9 of 93
1.45v is a nice number
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post #10 of 93
Quote:
Originally Posted by Princess Garnet View Post
Where is 1.45V listed as the limit? I recall the 1.3625V being thrown around, and people generally accepted up to 1.4V, or sometimes 1.45V, but I don't recall Intel ever listing those numbers. Again, I could be wrong here.
It was in a PDF that Intel released showing that 1.45V is the maximum that they feel is safe for the 45nm Core2 series (and I think even the 45nm Pentiums Dual Cores that got released). Except, some people didn't care and went higher than 1.45V for like CPU-Z validations and what-not and never had any problems.

Besides, 0.85V - 1.3625V is just the VID Voltage Range. From what I've learned, it sounds like it is just the range of voltages that can be automatically selected by a motherboard when the voltage is set to Auto.

The VID range for Sandy Bridge being 0.25V to 1.52V makes me wonder just what the hell is going on. lol I mean damn, are these CPUs tanks? Or could this be Intel's attempt at finally giving us the kind of information we want?
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