Stress testing concerns

[Andrewf]

So my i7-4790k is 4.8Ghz @ 1.315V

Not too shabby, eh? I thought so, until my stress test after 30 minutes showed max core temps around 80c. It seems like they only peeked around there for a while then go back down. I'm not sure what's causing this, because the average temperature is closer to the max temp of 74c. The temps definitely stay under 70c during a benchmarking test such as Cinebench, which I just recently got 952, and I'm very proud of. 952 BEAT THAT. Anyway, I want to be able to stress test for at least 6 hours to ensure my stability but I'm afraid of running for that long while it's getting that hot.

 

I haven't ever seen over 80c in Aida64 though, and obviously I never use Prime95 except that one time I did a 5 minute test, came back and saw it was at around 100c the whole time, I punched quite a few things in anger.

[Godlygamer23]

What cooler are you using?

[Andrewf]

What cooler are you using?

I have a Corsair H110.

But detailed fan and airflow stats are on my profile, I thought everyone does that, that way everyone doesn't have to write everything out every time.

[Godlygamer23]

I have a Corsair H110.

But detailed fan and airflow stats are on my profile, I thought everyone does that, that way everyone doesn't have to write everything out every time.

I don't normally check people's profiles. How fast are your fans on your rad spinning under full load? You could reduce temperatures a little by turning up the fans if possible.

[Andrewf]

I don't normally check people's profiles. How fast are your fans on your rad spinning under full load? You could reduce temperatures a little by turning up the fans if possible.

The CPU includes the two rad fans. CPU OPT is the Pump, Chassis1 is the bottom noctua, Chassis2 is the front intake, and Chassis3 is the rear intake

[Biased Opinion]

1.315 volts is pretty high and may cause the chip to die faster. I would never go past 1.3 on day to day use unless it's the pentium. That thing you can push hard. As far as temps go I'm ok with anything under 90

[Acerpwns]

1.315 volts is pretty high and may cause the chip to die faster. I would never go past 1.3 on day to day use unless it's the pentium. That thing you can push hard. As far as temps go I'm ok with anything under 90

its usually not voltage that degrades the chip, its the constant high temps that do. As long as the temps stay <80°C during use 1.315V is fine

[Andrewf]

1.315 volts is pretty high and may cause the chip to die faster. I would never go past 1.3 on day to day use unless it's the pentium. That thing you can push hard. As far as temps go I'm ok with anything under 90

I lowered it to 1.312 volts actually and it seems just as stable. Also it's not manual, or "constant" voltage. I have it at adaptive voltage, going as low as possible while idle, under .8 volts. When it's under load, then it rises up to 1.312.

 

its usually not voltage that degrades the chip, its the constant high temps that do. As long as the temps stay <80°C during use 1.315V is fine

So my actual everyday use would be video editing for 2-6 hours max, and that doesn't actually use much, until I start rendering which depends on the quality of the film. Currently it takes about 45 seconds on the minute of a 1080p 29.97 fps gopro video to render, and the temps are staying well under 60c while rendering.

[ablangc]

So my i7-4790k is 4.8Ghz @ 1.315V

Not too shabby, eh? I thought so, until my stress test after 30 minutes showed max core temps around 80c. It seems like they only peeked around there for a while then go back down. I'm not sure what's causing this, because the average temperature is closer to the max temp of 74c. The temps definitely stay under 70c during a benchmarking test such as Cinebench, which I just recently got 952, and I'm very proud of. 952 BEAT THAT. Anyway, I want to be able to stress test for at least 6 hours to ensure my stability but I'm afraid of running for that long while it's getting that hot.

 

I haven't ever seen over 80c in Aida64 though, and obviously I never use Prime95 except that one time I did a 5 minute test, came back and saw it was at around 100c the whole time, I punched quite a few things in anger.

 

Nice job overclocking.  I was able to get 4.8 GHz @ 1.325 and maintain temps around the mid 80's.  It's the temperatures that kill your CPU slowly, not the voltage.

 

But.......My Cinebench score is 957.  Now beat that!  LOL

[ablangc]

Update...... ran it again and got a 983 after reboot. 

 

Ran the test again 975

[Andrewf]

Update...... ran it again and got a 983 after reboot. 

 

Ran the test again 975

why you little... I haven't had time to reattempt and overclock for Cinebench scores... disregarding true stability. I do now, so just you wait!

[D2ultima]

Not too shabby, eh? I thought so, until my stress test after 30 minutes showed max core temps around 80c.

 

It's the temperatures that kill your CPU slowly, not the voltage.

TJMax is 100 degrees for those chips, and the temps do not kill slowly. My i7-950 spent a good four years at 80-90 degrees (it was in a laptop and I didn't have any tools to use better paste at the time) and it still works. Voltage, however, will do it.

[Godlygamer23]

Nice job overclocking. I was able to get 4.8 GHz @ 1.325 and maintain temps around the mid 80's. It's the temperatures that kill your CPU slowly, not the voltage.

But.......My Cinebench score is 957. Now beat that! LOL

Wrong. Voltages can kill any chip regardless of temperatures. The more voltage you add, the more degradation is put on the circuits. Both temperatures and voltage can kill chips.

[Andrewf]

Wrong. Voltages can kill any chip regardless of temperatures. The more voltage you add, the more degradation is put on the circuits. Both temperatures and voltage can kill chips.

Yeah. There's some crazy math and quantum theories that go along with it. Indeed, overvolting a cpu is more harmful over the long term than overheating, but as with everything else, it really depends. Since I use adaptive mode, most of the time while browsing the web and even playing games, the voltage decreses and only rises as needed. Greatly extending the life. I could potentially go up to 4.9Ghz and use it everyday, but I plan to edit very often and it's not worth the extra voltage and heat.

 

By the way, I did go up to 4.9Ghz @ 1.34V, and got 975 on Cinebench. Looks like you win. Perhaps my cpu was slightly scarred when I accidentally left it at over 100c for about 5 minutes. ugh. Oh well at least I have the PTPP.

[runit3]

So my i7-4790k is 4.8Ghz @ 1.315V

Not too shabby, eh? I thought so, until my stress test after 30 minutes showed max core temps around 80c. It seems like they only peeked around there for a while then go back down. I'm not sure what's causing this, because the average temperature is closer to the max temp of 74c. The temps definitely stay under 70c during a benchmarking test such as Cinebench, which I just recently got 952, and I'm very proud of. 952 BEAT THAT. Anyway, I want to be able to stress test for at least 6 hours to ensure my stability but I'm afraid of running for that long while it's getting that hot.

 

I haven't ever seen over 80c in Aida64 though, and obviously I never use Prime95 except that one time I did a 5 minute test, came back and saw it was at around 100c the whole time, I punched quite a few things in anger.

80C is nothing to worry about while synth testing. If you were going to pin it at 85-90C for 8 hours I would be apprehensive, but I'm perfectly comfortable with 6-8hr @~80C, and I've done it with a few Haswells now.

 

Come join us over in the Cinebench thread -> http://linustechtips.com/main/topic/62476-post-your-cinebench-r15r1152003-scores-over-250-submissions/

[ablangc]

Wrong. Voltages can kill any chip regardless of temperatures. The more voltage you add, the more degradation is put on the circuits. Both temperatures and voltage can kill chips.

 

Unless you are doing something stupid like 1.4V on air.  I know plenty of people who achieve 1.4 core voltage custom loop with a 4790k @ 5 GHz who maintain moderately low temps given the conditions under load.  Are they destroying their chip with those high voltages?  Just want to know your point of view in this case instead of just saying "Wrong."  In this case if they are slowly degrading their chip, how long till it is rendered inoperable?