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Ivy Bridge safe voltages. - Page 2

post #11 of 18
Quote:
Originally Posted by pantsaregood View Post

I know VID is not the same as Vcore. What I'm trying to say is that my CPU's Vcore is closely matching its VID because of how LLC is configured.

If you want me to be more specific, VID is 1.446V and Vcore is 1.443V.

This tells you what voltage my CPU is receiving - around 1.45V. I already knew my CPU was receiving 1.45V. I'm trying to find some reference for what voltages Ivy Bridge begins to degrade at, not how to discern between VID and Vcore.

 

No, your CPU isn't receiving 1.45V. It's receiving 1.443V. The VID is simply an informational number that indicates what the CPU "thinks" it should need for that multiplier and that clock speed. It is not a voltage that is being applied to the CPU. The only way to know what voltage is being applied to the CPU is by looking at the Core Voltage.

 

http://www.overclock.net/t/665362/vid-voltage-identification-explained

 

Yes, the post is old, but the information still applies just as much now as it did then.

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post #12 of 18
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

No, your CPU isn't receiving 1.45V. It's receiving 1.443V. The VID is simply an informational number that indicates what the CPU "thinks" it should need for that multiplier and that clock speed. It is not a voltage that is being applied to the CPU. The only way to know what voltage is being applied to the CPU is by looking at the Core Voltage.

http://www.overclock.net/t/665362/vid-voltage-identification-explained

Yes, the post is old, but the information still applies just as much now as it did then.

Again, I'm aware that VID and Vcore are not the same. This doesn't change the fact that my CPU is closely matching its rated VID (1.446V VID yields 1.443V Vcore for AVX, 1.422V VID yields 1.42V Vcore), nor does this discussion about VID vs. Vcore have any relevance in what constitutes safe core voltage.

The question was "do Ivy Bridge CPUs tend to degrade at 1.45V?"
post #13 of 18
Quote:
Originally Posted by pantsaregood View Post


Again, I'm aware that VID and Vcore are not the same. This doesn't change the fact that my CPU is closely matching its rated VID (1.446V VID yields 1.443V Vcore for AVX, 1.422V VID yields 1.42V Vcore), nor does this discussion about VID vs. Vcore have any relevance in what constitutes safe core voltage.

The question was "do Ivy Bridge CPUs tend to degrade at 1.45V?"

 

It's not at 1.45V. The VID is not a voltage that is being applied to the CPU.

 

Your CPU is at 1.443V. It doesn't matter if it's close to the VID. It doesn't mean that the VID is a voltage that is being applied to the CPU. It's not a voltage that's being applied to anything at all.

 

ANYWAY....

 

Degradation will really only occur if you have the CPU under heavy loads often, but it might only show up after a year or two - and you might only need to decrease the core clock or increase the voltage upon seeing degradation. In other words, yes, but it probably won't kill your CPU.

 

Again, do not go by the VID. Ever. Go by the Core Voltage.


Edited by TwoCables - 10/22/17 at 12:22am
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post #14 of 18
Quote:
Originally Posted by pantsaregood View Post

Warning: Spoiler! (Click to show)
Again, I'm aware that VID and Vcore are not the same. This doesn't change the fact that my CPU is closely matching its rated VID (1.446V VID yields 1.443V Vcore for AVX, 1.422V VID yields 1.42V Vcore), nor does this discussion about VID vs. Vcore have any relevance in what constitutes safe core voltage.

The question was "do Ivy Bridge CPUs tend to degrade at 1.45V?"

short answer:

yes.


a bunch of stuff to explain it:

through out the last few years, puts it ~3-5 years after ivy, a few folks who had been using 1.45-1.51 Vcore under water started to report/post about instability issues and needing to lower core speed. those individual reports would generate input from others and out of (i'm guessing) a dozen or so "samples" a few were ok but by ~5 years (just recent) i only recall one person stating no change.

on a side note:

though your temps look fine, that still seems like a lot of Vcore for 4.7 or did i read something wrong?

if so, you might want to consider dialing back to were you start to get diminishing returns for voltage esp. if you got the chip used.
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post #15 of 18
Thread Starter 
Quote:
Originally Posted by looniam View Post

short answer:

yes.


a bunch of stuff to explain it:

through out the last few years, puts it ~3-5 years after ivy, a few folks who had been using 1.45-1.51 Vcore under water started to report/post about instability issues and needing to lower core speed. those individual reports would generate input from others and out of (i'm guessing) a dozen or so "samples" a few were ok but by ~5 years (just recent) i only recall one person stating no change.

on a side note:

though your temps look fine, that still seems like a lot of Vcore for 4.7 or did i read something wrong?

if so, you might want to consider dialing back to were you start to get diminishing returns for voltage esp. if you got the chip used.

Thanks! Rolled back 50mV to a stable 4.6 GHz. 4.7 GHz behaves a bit different from any other CPU I've ever seen - it requires a fairly significant amount of extra voltage, but 4.8 GHz only needs an additional 0.015V over 4.7 GHz.
post #16 of 18
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post #17 of 18
1.45v is way too much for ivy bridge and will degrade it within 6 months from personal experience to the point that you won't be running the same overclock after this time.

Stay under 80c and 1.375v at the max 24.7. To be on the safe side I'd stay under 1.35v.
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post #18 of 18
Quote:
Originally Posted by $ilent View Post

1.45v is way too much for ivy bridge and will degrade it within 6 months from personal experience to the point that you won't be running the same overclock after this time.

Stay under 80c and 1.375v at the max 24.7. To be on the safe side I'd stay under 1.35v.

 

But your degradation experience happened when you were Folding 24/7.

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