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Skylake-X - running an i9-7980XE at 1.425V VCore 24/7

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post #1 of 35 (permalink) Old 11-08-2018, 11:19 AM - Thread Starter
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Skylake-X - running an i9-7980XE at 1.425V VCore 24/7

So looking at Intel specs, the maximum input voltage (Vccin), Vccio (supply for processor i/o), and Vccsa (supply for integrated i/o controller), are all specified as 2.15V, 1.35V, and 1.35V, respectively.

However, the maximum per core voltage is somewhat nebulous. I am currently sitting at a 4.9 GHz overclock at an all Vcore voltage of 1.325V (1.825V Vccin). Getting to 5.0 GHz all core performance will require a core voltage across all cores of 1.425V.

The question is: Can I get 5 years of life out of this CPU if I run it at full load, 24/7, at a core voltage of 1.425V, assuming that I keep core temperature at or below 80 C?

Is this within the realm of possibility, or will the CPU be partially and/or fully dead in a much shorter time frame due to electromigration and other effects?

Update:

It looks like there is a treasure trove of other info with regard to Skylake-X overclocking that is slowly building up in this thread that is unrelated or only tangentially related to my original question. If you are in the process of overclocking your Skylake-X CPU or trying to get the most out of your CPU/MB, you may want to give this thread a quick read-over and see if you discover some proverbial diamonds in the rough.

Last edited by mikegold10; 11-09-2018 at 12:23 PM.
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post #2 of 35 (permalink) Old 11-08-2018, 11:33 AM
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Chances are only Intel will know for sure. Anything else you hear on the forums and such is all word-of-mouth. And nobody will have long-term failure rates as the chip hasn't even existed for that long yet.

The only way to find out is to get a large sample of them and test them under elevated environments until they fail. Once you have enough data points to draw a curve, you can extrapolate the failure rate according to Black's Equation.

I doubt anybody outside of Intel cares enough and has the resources to do an experiment like this.
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post #3 of 35 (permalink) Old 11-08-2018, 12:02 PM
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You must have a really good xe. My re-lid at x47/1.200 v was at 330 w tdp and heading above 85 deg within 30 secs of 100% loading doing videofile conversions. This with a custom loop, HK4/EK D5 revo 140/Black Ice 360GTX. Going >1.3v sounds scary. Until I figure out if the cooling and settings can be improved, I'm sticking to x45/1.15v.
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post #4 of 35 (permalink) Old 11-08-2018, 12:24 PM - Thread Starter
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Quote: Originally Posted by hdtvnut View Post
You must have a really good xe. My re-lid at x47/1.200 v was at 330 w tdp and heading above 85 deg within 30 secs of 100% loading doing videofile conversions. This with a custom loop, HK4/EK D5 revo 140/Black Ice 360GTX. Going >1.3v sounds scary. Until I figure out if the cooling and settings can be improved, I'm sticking to x45/1.15v.
Actually, this has nothing to do with the i9-7980XE I am using, an average performer at best. At the same Vccin and VCore (and freq, and assuming all else equal [i.e., cooling, etc...]), if your XE can run stable, it will consume the same amount of power thus producing the same temperatures (above ambient) under the same load. Of course silicon quality will play a small role in your ability to reach stability, due to the number of (recoverable) defects on the chip. But, to perform any operation, on average, any two samples of the chip consume (within a tiny margin of error) the same amount of power assuming all else is equal and will thus generate the same level of heat.

The reason I can get 4.9GHz and even 5.0GHz (no-AVX), is because I connected my water block directly to the silicon using der8auer's DirectDieFrame via Conductanaut LM. Relidding only causes their to be two contact surfaces instead of one, thus increasing CPU temperature(s) and limiting overclocking.

For example, I am doing a very long multi-core rendering stability test right now (i.e., 72+ hours at temps similar to Prime95 FFT small no-AVX) at 4.9 GHz/1.325 VCore/1.825 Vccin/3.1 GHz mesh at 1.15V/128 GB of RAM at 3000MHz/15/15/15 (no-AVX). The power drawn at the wall is almost a constant 750 W (EVGA 1600W Titanium PS). I slightly hacked the VRM heatsink to get things stable and have a fan blowing on it.

Last edited by mikegold10; 11-08-2018 at 12:46 PM.
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post #5 of 35 (permalink) Old 11-08-2018, 01:01 PM - Thread Starter
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Quote: Originally Posted by Mysticial View Post
Chances are only Intel will know for sure. Anything else you hear on the forums and such is all word-of-mouth. And nobody will have long-term failure rates as the chip hasn't even existed for that long yet.

The only way to find out is to get a large sample of them and test them under elevated environments until they fail. Once you have enough data points to draw a curve, you can extrapolate the failure rate according to Black's Equation.

I doubt anybody outside of Intel cares enough and has the resources to do an experiment like this.
Well, any reports of damage caused by voltages that are too high (or degradation) can be used for simple extrapolation to lower voltages. Since the chip has been out for over a year and other Skylake X parts even longer, it would be interesting if such reports surface, so that a ballpark maximum voltage can be determined based on those sample points.
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post #6 of 35 (permalink) Old 11-08-2018, 01:27 PM
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Hi,
If you burn it up within 3 years you can always rma it
Get Intel protection plan

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post #7 of 35 (permalink) Old 11-08-2018, 07:53 PM
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How's your temps at 4.9? and cooling? Did you try 1.35/1.91?
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post #8 of 35 (permalink) Old 11-08-2018, 08:46 PM
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Last edited by kingofblog; 11-11-2018 at 06:56 PM.
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post #9 of 35 (permalink) Old 11-09-2018, 07:25 AM - Thread Starter
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Quote: Originally Posted by ThrashZone View Post
Hi,
If you burn it up within 3 years you can always rma it
Get Intel protection plan
You can't RMA a heavily overvolted, overclocked, and most important of all DELIDDED CPU:



(Photo credit: wccftech)

Last edited by mikegold10; 11-09-2018 at 07:28 AM.
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post #10 of 35 (permalink) Old 11-09-2018, 07:26 AM - Thread Starter
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Quote: Originally Posted by Kana Chan View Post
How's your temps at 4.9? and cooling? Did you try 1.35/1.91?
IIRC I am barely hitting 70 C (max) on a core or two on the most strenuous Prime95 FFT small (no-AVX) test run at 24+ hours. Most of the cores are in the 60s (max). Avg. is in the 60s on all cores.
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