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If your Haswell is stable, is it actually high _voltage_ or high _temperature_ that will hurt it over time? (How bad are high cache volts really?) - Page 2

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

Keep in mind that is only one report. I would take that with a grain of salt. If we see more reports like that I would start to take notice.

Ivy bridge (22nm) could handle 1.4 vcore easily (combined with good temps), and 1.9v Input Voltage is not high at all.

HardOCP.com have noted and documented degradation in their chip @1.35V.

Since these guys know very well what they say and write, I don't think we need any more reports. In fact, I don't think that Haswell degradation at or above 1.35V VCore is up for debate.
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post #12 of 18
Quote:
Originally Posted by Arxontas View Post

HardOCP.com have noted and documented degradation in their chip @1.35V.

Since these guys know very well what they say and write, I don't think we need any more reports. In fact, I don't think that Haswell degradation at or above 1.35V VCore is up for debate.

I dont think you can say 1.35v will degrade in every application though. Your statement is too general. If I set my vcore to 1.45v and spend 99% or my time browsing the web and gaming 3hours a week my chip is obviously going to degrade slower than someone who runs prime95 60 hours a week( no idea why, just an example).
\
Whith cstates enabled the chip is spending 90% or the time at a lower vcore. I think every application is going to be different as well as each chip is different.
Edited by Wirerat - 5/4/14 at 10:52am
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post #13 of 18
I have been running Haswell since launch of 2013.

I killed my first 4770K due to excessive voltage 1.8V. 1.8V or higher will most likely lead to death. I was only using watercooling. Thankfully intel accepted my cpu as per RMA and sent me a new one:)

in the summer I run 1.38V @ 4.6GHz

in the winter I run 1.45V @ 4.7GHz

I personally feel under 1.45V is acceptable for 24\7 Use if you can cool the beast.

I have benched both 4770k and 4670k at over 1.7V, no problems. both chips still kicking and I really dont think I degraded them at all.
post #14 of 18
Thread Starter 
I'm only hearing isolated instances of examples for and against. No one is citing numbers in depth.

It's also been said in Darkwizzie's Guide and elsewhere that in point of fact, there might not be any good data (big numbers) out there. Who wants to test a lot of chips to death just to find exactly where they die? Further, we already know there is serious variation in OC ability. There's undoubtedly variation in longevity versus conditions, too.

On the average, my PC is off/standby two-thirds of the time, and practically idle all the rest. So my issue is whether volts but not temps matter, since I never run hot IRL. I don't need opinions; everyone has one. Can anyone point to studies or metaanalyses on at least 10 CPUs, preferably 100+? At what VIDs or other volts did the CPUs die?

I'm just asking. That's all. If there aren't hard numbers, there aren't.

Thanks ya'll smile.gif - RK7
post #15 of 18
Quote:
Originally Posted by RedKnight7 View Post


Can anyone point to studies or meta-analyses on at least 10 CPUs, preferably 100+? At what VIDs or other volts did the CPUs die?

I'm just asking. That's all. If there aren't hard numbers, there aren't.

I think you will be hard pressed to find this type of raw data compiled already. Haswell is still very much in its infancy, even tho it is widespread globally.

One may have to look at individual cases and chart the data themselves at this point of time.

Jut re-read your comment on ring voltage.

Currently I run my i7 ring voltage at 1.45V. On my i5 I run it at 1.4V. Both cache ratios are set for 4400MHz..

Been running this type of ring voltage for almost a year with no signs of degradation or negative effects at this point.
post #16 of 18
4770k 4.4 at 1.28 daily.. I won't go any higher than 1.3v personally. This thing is so fast as it is. I'm delided and max temp rendering or mining is about 55c.
I do a lot of video renders for youtube and solidworks. and my pc is on 24/7

1.5v is the most I'd ever push on a full water loop and that would be just for benching. I'm on a corsair H110, my chip will do 4.6 at 1.42 but I never tested for daily use cus the volts. I also didn't test any higher clocks after that. but it finishes all my benches in a row and 10x intel burn tests at 4.6
post #17 of 18
My current 4670K runs 4.6ghz core and 4.4 cache with 1.267 and 1.15 respectively. While this may be a pretty good chip by Haswell standards, I can't get it stable at 4.7 with as much as 1.4 into it. It does seem to be that as the circuits get smaller, they also become much more susceptible to decay.

Quote:
Originally Posted by ProKoN View Post


I personally feel under 1.45V is acceptable for 24\7 Use if you can cool the beast.

^ I agree with this. I ran my old i7-950 at 1.5 volts and 4.4ghz from 2011 until i got this haswell thing in mid 2013. That thing ran 24/7 folding at night and gaming/encoding during the day.
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post #18 of 18
Thread Starter 
Thanks for contributing everyone, whether you thought 1.4 V was high or low.

To me it seems like the conclusion is that ... there isn't really a conclusion. Yet.

But it's pretty clear one is at least in a grey area. So if you want to be cautious, do!

I'll probably keep my cache at 1.392 V so it can keep up with my Cores at 44.

Maybe I'll end up on the Haswell Death/Degradation thread.

Let's find out. smile.gif
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Overclock.net › Forums › Intel › Intel CPUs › If your Haswell is stable, is it actually high _voltage_ or high _temperature_ that will hurt it over time? (How bad are high cache volts really?)