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Did we ever come a conclusion on safe SB voltages? - Page 4

post #31 of 93
Quote:
Originally Posted by srsparky32 View Post
there seems to be some confusion here.

-VID does not mean that you can jack it up to 1.52v and overclock to 5ghz and be fine. VID is the maximum voltage that CPU's from the factory can take AT STOCK and be fine.

-1.45v is really okay, even at high overclocks.

-its not the voltage that causes degradation. its the temperatures. if youre worried about degradation, invest in better cooling.

-stability is dependent on temperatures as well.

so, if you dont want electromigration to occur at high freq/voltage, keep your CPU cold.
YES YES YES. So many here are scared of voltage, it's an overclocking site dammit! It's temps you need to be scared of, use good cooling!

As I have said elsewhere, when Intel puts a 1.52 max recommendation on SB, you know that they're building in a fudge factor, they're not going to put it in writing if it'll kill your cpu.
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post #32 of 93
Further to my post above, I raised vcore .010 and my vid went from 1.3861 to 1.4011. I didn't change anything else.

Oops apologies for the sequential post, I had multi windows open. I was referring to my post on vid on the prior page.
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post #33 of 93
Quote:
Originally Posted by TwoCables View Post
The 1.45V I'm talking about is for 45nm Core2 CPUs (and I think 45nm Pentium Dual Cores too).

Here's the article you may be thinking of that talks about 1.425V being the safe 24/7 limit:

http://hardforum.com/showthread.php?t=1578110
I wasn't talking about Sandy Bridge with the reference to the 1.45V number; rather about 45nm Core 2, so that thread wasn't what I was thinking of (I never saw that thread).

Again, I never heard of that number being referenced as the official limit for the 45nm Core 2s either. The only thing I saw, other than the 1.3625V number, were the "unofficial" claims of ~1.4V or sometimes ~1.45V for them.
Quote:
Originally Posted by srsparky32 View Post
-VID does not mean that you can jack it up to 1.52v and overclock to 5ghz and be fine. VID is the maximum voltage that CPU's from the factory can take AT STOCK and be fine.
This sounds like it pretty much falls in line with what I found/mentioned earlier.
Quote:
Originally Posted by srsparky32 View Post
-its not the voltage that causes degradation. its the temperatures. if youre worried about degradation, invest in better cooling.

so, if you dont want electromigration to occur at high freq/voltage, keep your CPU cold.
I thought it was both that cause electromigration? I knew the combination of both were the ultimate pair, but I thought either one too much out of range was bad?
Quote:
Originally Posted by keto View Post
YES YES YES. So many here are scared of voltage, it's an overclocking site dammit! It's temps you need to be scared of, use good cooling!
See, I've also heard others parrot the other end of the scale, that "Intel says 100C is the limit, I've run 90C 24/7 for two years and it's fine!" and it makes your head spin.
post #34 of 93
Quote:
Originally Posted by srsparky32 View Post
there seems to be some confusion here.

-VID does not mean that you can jack it up to 1.52v and overclock to 5ghz and be fine. VID is the maximum voltage that CPU's from the factory can take AT STOCK and be fine.

-1.45v is really okay, even at high overclocks.

-its not the voltage that causes degradation. its the temperatures. if youre worried about degradation, invest in better cooling.

-stability is dependent on temperatures as well.

so, if you dont want electromigration to occur at high freq/voltage, keep your CPU cold.
I wish that Intel was more forthcoming with what these chips can actually use. I wish that there was some concrete data about at what temperature does degradation actually become an issue. 90C? 80C?

Right now I have my 2500K running at ~1.4v under load at 4.9Ghz. I still need to do a 12Hr Prime, but after running Prime95 Blend for a couple of hours it seems pretty stable. I'll know Sunday night if it really is. I'm having it spike up into the mid 70's, but it stabilizes in the upper 60's after about 10min. I wonder if it's worth going for 5Ghz. I have a feeling that it can do it with less than 1.45V, but I wonder how safe that is in the long run.

I guess that we really won't know what is safe/dangerous for a few more years. At which point it'll either be good or bad news for those of us using 1.4+.

Personally I don't really feel comfortable going above 1.4v with a 32nm chip, but there are plenty of users going way over that. However, the lack of concrete evidence of what is and isn't safe makes the choice of going over 1.4v a though one.
Edited by AtomicFrost - 10/28/11 at 11:21pm
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post #35 of 93
1.55v is good for me, that's what my mobo limits it too

lol jk

I like keeping mine under 1.372...
post #36 of 93
Intel wont do that though. because noobs will read their datasheet and say HEY okay its fine here, so ill crank it up to 5ghz at 1.52v with my stock cooler. you know. stuff like that.

also @ princess garnet: nope. thats why dry ice and liquid nitrogen work so well. you can jack the voltage up all the way and the CPU will survive and keep on doing what it did before. at hotter temperatures the transistors get less efficient hence why instability can occur. also, at hotter temperatures the electrons get unstable and they start moving around more. when theyre cold, they dont move around as much. temperature is like 95% key to CPU survivability and stability. the other 5% is voltage
 
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post #37 of 93
Quote:
Originally Posted by srsparky32 View Post
Intel wont do that though. because noobs will read their datasheet and say HEY okay its fine here, so ill crank it up to 5ghz at 1.52v with my stock cooler. you know. stuff like that.

also @ princess garnet: nope. thats why dry ice and liquid nitrogen work so well. you can jack the voltage up all the way and the CPU will survive and keep on doing what it did before. at hotter temperatures the transistors get less efficient hence why instability can occur. also, at hotter temperatures the electrons get unstable and they start moving around more. when theyre cold, they dont move around as much. temperature is like 95% key to CPU survivability and stability. the other 5% is voltage
That's true. Although I'm sure that a lot of people are killing their CPU's with voltages that they think are safe.

Also, upping the vcore using offset or extra turbo voltage (depending on motherboard features) instead of using a fixed voltage could also allow the use of higher voltages for safe long term use. I wonder how many people on here are actually using an offset voltage boost instead of a manual voltage, and I wonder if it increases the chips lifespan.
Edited by AtomicFrost - 10/28/11 at 11:31pm
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post #38 of 93
who cares what the limit is. Most of us will probably upgrade in 2-3 years. So in those years, you can have all the e-peen you want
    
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post #39 of 93
I have a question... if using "Offset" mode enables your Vcore to be significantly lower, why doesn't everyone do it?

So someone worried about being at 1.42v can just use offset mode and be somewhere around 1.37v

(I'm aware this could be a noobish question)
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post #40 of 93
I think voltage is all about how long you want the processor to last. Stock voltage could run an i7 24/7 for like 20+ years. I'd wager 1.4v would easily give 5+ years.

Since I plan on replacing my 2700K with IB in less than 6 months, I take mine almost up to the Intel spec sheet max voltage. I run 1.51v for 5.3 Ghz and easily think it will make it six months. If it doesn't, I'll be sure to let you all know lol.

Edit: I think it is silly to stress test with Prime 95 and Intel Burn test. You put a lot more stress and heat through your CPU than you ever would just using Windows and gaming. People that run IBT for days at a time I think are doing more harm than good.

I just use Windows and play games and incrementally increase the voltage until everything is stable and doesn't crash. All the while, the CPU temps are much lower than using something like IBT. Even a CPU limited heavy use game, the temps won't get near anything like IBT.

It's just like burning in your GPU with something like Furmark, something that is completely unnecessary and doesn't replicate real world use.
Edited by CallsignVega - 10/29/11 at 5:40am
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