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e8400 Volts & Speed

post #1 of 14
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Hey guys,

Just wondering, I currently have my e8400 under Xigmatek S1283 @ 4.22 GHz and 1.384v vCore at idle. The temperature is idling in real temp at about 35 degrees.

Now given that my heatsink was only put on a week ago, and theoretically the AC MX-2 I've applied won't burn in for about another month or so. Is 60 deg load temp in RealTemp okay? This is after running Orthos for about 4 hours. 25 degrees seems to be a lot of movement. Case cooling is pretty good too, 3x 120mm's, Dominator fans, GTS 512 sends hot air out the back... Hmmm. Or am I just being nervous

Also, is 1.384v (CPU-Z reading) acceptable for 4.2 or does it seem a little high? That is the lowest setting I can get to keep it 6+ hours stable in Orthos. I seem to hit a vCore wall at around 4 flat (as, it seems, most people do) and the thing is stable (relatively, lol) up to about 4.5 but temps are through the roof.

Please let me know if you have any advice on this one.

Thanks heaps in advance!

-- D
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post #2 of 14
Your doing much better than I am, so well done.

I've got the MX2 as well but read that it has little or no 'burn in' time like AS5 and others do.

Don't forget that the 60c load temp is the internal temp of the CPU and that the max is anywhere between 95 and 105c (depending on who you ask). If your CPU case temp was really high, then you can check things like HSF fitting, TIM application etc. But for core temp, you really only have Vcore and CPU frequency to play with to reduce.

Also, the Intel recommended max voltage is 1.3625v. If you need to go over to get to a certain target, thats your call.

1.384v to get to 4.2GHz - fantastic in my view. All depends mainly on the specific CPU you have (and I think a tiny bit on the quality of PSU and motherboard). I've heard of people getting to 4 with really low volts. I've heard of others that can't get there with safe volts at all. It's the luck of the draw. Some people go by batch numbers etc. to tell but going by that I should have a great chip - but I don't.

Just do the best you can with what you have...
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post #3 of 14
"Also, is 1.384v (CPU-Z reading)" <----- I think you are running that chip with WAY too much vcore. Considering CPU-Z only shows the vcore after the vdroop your bios vcore must be a lot higher. The MAX vcore for this chip is 1.3625v or Intel says you can expect severe degradation in the life expectancy. We've already had a couple guys burn their 45nm out. Set it at 1.3625v MAX in bios. Use the bios settings for an accurate vcore. Not the CPU-Z. ~JadeMiner~
    
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post #4 of 14
I'm not sure how that cooler compares, but for comparison sake, I have a lapped Tuniq Tower and uncured as5 pumping 1.456v under load and max it goes is 54c in RealTemp.

Also giving more than 1.3625v causing the chip to burn out is false.
http://www.xtremesystems.org/forums/...179965&page=14

The OP's post:
Quote:
UPDATE/CONCLUSION

Well guys, I can confirm now that my CPU's did not actually degrade.

It is apparent now that the 45nm CPU's have a burn-in period of about
1 - 2 weeks, after this time the CPU's will need a small bump in vcore
(.024mv - .050mv) to regain initial prime stability.

My CPU's are rock solid stable now, and are not showing any other signs
of further degradation, I even had the vcore on one up close to 1.5v for
some suicide runs, and still did not hurt it.
post #5 of 14
Quote:
Originally Posted by ocnjk View Post
I'm not sure how that cooler compares, but for comparison sake, I have a lapped Tuniq Tower and uncured as5 pumping 1.456v under load and max it goes is 54c in RealTemp.

Also giving more than 1.3625v causing the chip to burn out is false.
http://www.xtremesystems.org/forums/...179965&page=14

The OP's post:
According to your link. 45.3% of the people in that poll experienced degradation of the chip by running it too high. And we also have the people here that will tell you first hand they fried their CPU with too much vcore. This is not a 65nm chip. It's a 45nm chip and much more suceptable to damage from overvolting. But to each his own I suppose. I'll never run mine 24/7 past 1.3625v. ~JadeMiner~
    
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post #6 of 14
Read 45nm related article in my signature

Running 45nm chips above 1.365 volts will severely damage the CPU in a dangerously short time. Expect around 20 days, if you that lucky..

I would drop your voltage to 1.35 (real voltage, not BIOS setting) and keep it under that.

Most E8400 users get about 4Ghz on 1.28-1.32 volts, so yes, you are running it quite high.
    
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post #7 of 14
Quote:
Originally Posted by JadeMiner View Post
According to your link. 45.3% of the people in that poll experienced degradation of the chip by running it too high. And we also have the people here that will tell you first hand they fried their CPU with too much vcore. This is not a 65nm chip. It's a 45nm chip and much more suceptable to damage from overvolting. But to each his own I suppose. I'll never run mine 24/7 past 1.3625v. ~JadeMiner~
The poll actually states 41.43% of people believe they experienced degradation by supplying more than 1.3625v.

39.23% they have no experienced any degradation by supplying more than 1.3625v.

If there really was a degradation problem, the numbers on the poll should reflect that, not be so close by about 2%.
post #8 of 14
Quote:
Originally Posted by ocnjk View Post
Also giving more than 1.3625v causing the chip to burn out is false.
http://www.xtremesystems.org/forums/...179965&page=14
I personally think it is far too early on to make that judgement. From what I read of the latest posts, 3 people found the same thing. And then the latest post:
Initially I though I might have degraded the CPU by benching @1.43 for an hour or so. I was Prime stable at 4200MHz @ only 1.33V, and when I re-tested Prime stability after the benching session (roughly 2 weeks later) it took 1.35V to be stable. Naturally I assumed that the 1 hour benching session caused it to degrade. Well, it has been close to 2 months since I even touched Prime or my BIOS, and the Vcore has been at a constant 1.35V with load temps in the high 40s, low 50s. I ran Prime today and it is not stable at 4200MHz even at 1.37V. What is up with that?? I am really confused, why does my stability continue to decline? No variables changed in the last 2 months and an Overclock which was Prime stable for over 16hours now fails in between 10-20minutes!!
All I'm trying to suggest is that if people want to go over recommended volts, fine, but they should be aware of what 'could' happen. This is especially the case if people (usually on a tight budget) want to hang on to their systems for a long, long time and don't buy new CPUs / Motherboards every year / month / week.
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post #9 of 14
Alright Im going to make this clear to the OP.

Those who recommend going over 1.365 volts or saying that this voltage is not detrimental to the health of their 45nm CPU are either biased, mis informed, or ignorant.

The amount of users having problems with 45nm CPUs and warm Vcore (not even high, but warmer voltages) is significant enough to say that most 45nm chips run risks of permanent damage when overvolted past stock settings, particularly going over the 1.365voltage spec rating provided by Intel.

If you believe otherwise, you run your own grave risk of losing hardware, regardless of its cost impact on a person.

/end thread. pm me if you have questions/comments regarding this info
    
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post #10 of 14
hhhmmmm could it be that intel have shipped a few less than perfect batches of procs and just not recalled them??

i know they recalled a few from the retail chain in the uk as i have a couple of mates who work for big retailers over here and they both had to ship unsold procs back as the had somthing wrong with them but nothing was done to those they had sold.

i remmebber not so long back we was all having this same debate over the drop from 90 to 65nm and we all still ended up throwing the same, if not more, volts thru our 65nm chips that we did to the 90nm ones. intel also said when they fisrt released the 65nm chips that they too should only recieve 1.3625v but what does it now say on their own site???? what 1.5v hhmm do you think they might change it again for these chips in another 18 month??? well time will tell and untill then you are right. it is at the owners own choice.

me, i have thrown 1.44v set in bios thru mine which equates to 1.365v under load. that got me to 4.2ghz which is what i wanted. do i think im overly concerned about what other people are saying? have they taken into account the fact that in the time since they first ran there chips at those speeds every other componant in there system will of also degraded slightly? because it has as do all ours.

ffs man we all overclock at our own risk, even if you are only upping the speeds at stock volts you are still increasing the chances over electronic migration.
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