I'm a bit concerned about running SETI for long periods every day; my CPU temperature goes up to about 80C while the app is running. Over years of running it for ~10 hours a day, will this shorten the life of my CPU by a lot? It's a 32-thread i9 clocked at the moment at 3.6GHz; should I slow down the clock?

I'm a bit concerned about running SETI for long periods every day; my CPU temperature goes up to about 80C while the app is running.

That is way too hot IMHO. 70° is about my limit for 24/7 running.
Either down clock, or better yet go for some after market cooling. A AIO (All In One) water cooler would be the way to go.

Your runtimes are way too long- 7+ hours where I would expect them to be 3hrs or less for your listed clock speed (depending on the application being used), so there could already be some thermal throttling going on there.

EDIT- I just noticed your other thread.
I'd suggest running the stock application for a while to get an idea of run times & temperatures. If your CPU is giving those sort of temperatures with those sort of runtimes, an optimised application could kill it.
Even a stock cooler should do better than the temperatures you're reporting (assuming ambient temperatures below 35°c).

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Grant
Darwin NT

Thanks for the advice. I'm using an NH-D15 cooler, the problem is that the chip is rated for 2.8GHz, it's overclocked on all 32 threads, which generates a massive amount of heat. I'll slow it down to get it under 70C.

At 3.2GHz it runs at 60C. To clarify, the 10 hours is the amount of time I run BOINC every day, not the amount of time it takes to complete a unit.

You might try turning HT off and run it with the real 16 cores.
You will get almost as much Seti done and I believe it will run a fair amount cooler.
You will be running 16 task instead of 32, but they will crunch almost twice as fast.
Then you may be able to overclock it again and still keep temperatures at a reasonable level.

Meow!

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"Freedom is just Chaos, with better lighting." Alan Dean Foster

At 3.2GHz it runs at 60C. To clarify, the 10 hours is the amount of time I run BOINC every day, not the amount of time it takes to complete a unit.

7.5 hours at 2GHz is way too long for a WU on such a system, even at stock speeds.
From what I can remember, my old Core 2 Duo which was well & truly overcommitted was able to do the present WUs in around 4-5hours. Less if it weren't trying to support two video cards.

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Grant
Darwin NT

You might try turning HT off and run it with the real 16 cores.
You will get almost as much Seti done and I believe it will run a fair amount cooler.
Then you may be able to overclock it again and still keep temperatures at a reasonable level.

Meow!

Although as Gene posted in his earlier thread, you get more work done per hour with HT on than with it off.

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Grant
Darwin NT

You might try turning HT off and run it with the real 16 cores.
You will get almost as much Seti done and I believe it will run a fair amount cooler.
Then you may be able to overclock it again and still keep temperatures at a reasonable level.

Meow!

Although as Gene posted in his earlier thread, you get more work done per hour with HT on than with it off.

Not by a large percentage.
And if he has to downclock in order to maintain cooler temperatures with HT on, he may actually end up ahead of the game if he can get his clock speed back up with HT off.

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"Freedom is just Chaos, with better lighting." Alan Dean Foster

Although as Gene posted in his earlier thread, you get more work done per hour with HT on than with it off.

Not by a large percentage.

119% improvement when running other projects & a GPU isn't significant?
11% improvement when running CPU only isn't significant?
Considering the lengths people go to just to get what amounts to 1-2% improvement in output, it's well worth it.

And if he has to downclock in order to maintain cooler temperatures with HT on, he may actually end up ahead of the game if he can get his clock speed back up with HT off.

Maybe, but unlikely.
Only one way to find out- do it.
As it is, the time taken per WU for the given clock speed is excessive- even with HT on.

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Grant
Darwin NT

Although as Gene posted in his earlier thread, you get more work done per hour with HT on than with it off.

Not by a large percentage.

119% improvement when running other projects & a GPU isn't significant?
11% improvement when running CPU only isn't significant?
Considering the lengths people go to just to get what amounts to 1-2% improvement in output, it's well worth it.

And if he has to downclock in order to maintain cooler temperatures with HT on, he may actually end up ahead of the game if he can get his clock speed back up with HT off.

Maybe, but unlikely.
Only one way to find out- do it.
As it is, the time taken per WU for the given clock speed is excessive- even with HT on.

When overclocking, I have always found HT to run much hotter and less stable.
As you said, the only way for him to find out is to do the experiments and see how it shakes out for him.

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"Freedom is just Chaos, with better lighting." Alan Dean Foster

A 2.8GHz rated chip clocked to 3.6GHz is way over the top for "normal" cooling and a decent life expectancy. No wonder the chip is getting very hot. It might be that part of the extended run times are due some form of automatic load shedding e.g. down clocking threads or cores in rotation to get temperatures within chip allowances. Such protective down clocking may not be visible to you as it could well be for a few milliseconds per thread/core.

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Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?

 
I would recommand not to exceed 75C for 10h operation a day or 70C for 24x7h operation. My current PC is now running for more than 5 years 24x7 without problems. My current processor is a AMD Ryzen 7 1800X CPU @ 3,7 GHz, working with 14 cores for BOINC running at 58C. If you have a big case with a good air flow and also a good cpu cooler you can reach these low temperatures (My configuration: Cooler Master MasterCase Pro and be quit! Dark Rock Pro 3 CPU Cooler).
 

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SETIspirit Homepage

My Ryzen 1800X is running at 52°C with an Noctua D 15.

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With each crime and every kindness we birth our future.

I'm finding my new 2700X systems run the cpu hotter than my first gen Ryzens. For the equivalent clock speeds, the 2700X run about 2-4° C. hotter. I wondered about the TDP spec for the Ryzen+ being 105W versus the 95W for the first gens. It seems AMD didn't lie. I assume either or both of the XFR and higher memory clocks account for the hotter chips. More cores boosting more often on the 2700X systems and running the memory at 3466Mhz vice the 3200Mhz of the Ryzen 1700/1800 systems.

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Seti@Home classic workunits:20,676 CPU time:74,226 hours

A proud member of the OFA (Old Farts Association)

Threadripper 1950x on custom loop 42 to 48ºC

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Kevin

1700X/1800X >> 62-72° C. on 280mm AIO.

2700X >> 68-74° C. on 280MM AIO/equivalent.

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Seti@Home classic workunits:20,676 CPU time:74,226 hours

A proud member of the OFA (Old Farts Association)

i7 4820K >> 48-56°C on Deepcool Captain 240EX 240mm AIO w/2 Noctua NF-F12 120mm 3000rpm fans.

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The T1 Trust, PRR T1 Class 4-4-4-4 #5550, 1 of America's First HST's

3930K @ 3500Mhz - 61C - Raijintek 240
3820 @ 3600MHz - 50C - Artic Freezer 240
1700X @ 3700MHz - 62C - Lepa 240 + AphaCool 240x45mm rad
x5680 @ 3300MHz - 62C - CoolerMaster D92
3820 @ 4100Mhz - 64C - Corsair H80i
960 @ 3200 - 68C - Zalman 92

30C Ambient right now.
It seems I can't make up my mind what CPU cooler to use when I see this list :P

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6860 @4 GHZ running 6 CPU+4GPU WU - 58C with a TT Water 3.0

Ambient temp hot as a hell (>34C) most off the day, now 30 C @ 5:50 AM.... ops time to sleep.

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If you go into advanced power settings, you can reduce the percentage power and then watch the power consumption. Depends on the machine, but sometimes you reduce the power % and then watch the power consumption drop by a third. Much simpler than changing the clock speed which is beyond me anyway. I tend to reduce by between 5 and 20 per cent
To aid cooling my laptops (all HP now) first had self-adhesive feet on the bottom to create airspace, but since then I have bought s/h docking stations which are cheap on eBay.
HTH

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