Noctua NH U12S SE AM4 or Corsair H115i PRO [2600x/3600x] - Page 6 - Overclock.net - An Overclocking Community

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Noctua NH U12S SE AM4 or Corsair H115i PRO [2600x/3600x]

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post #51 of 63 (permalink) Old 06-20-2019, 03:09 AM
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Thanks for the info.


Wish we knew what the temp of air flowing into air cooler was compared to room temp air flowing into radiator. If you are interested in monitoring airflow temp, here is link to how I do it as well as guide to optimizing case airflow.

https://www.overclock.net/forum/22319249-post5.html

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post #52 of 63 (permalink) Old 06-20-2019, 04:03 AM
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Kind of a predicatble result :-) When you test a CPU that acutally is able to transfer the heat efficiently to the haetspreader, the results will change significantly. (I'm looking at you, Intel - with stock vs direct die temp differences of 20c!). That's the main reason I skip reviews when they use a non-delidded 7700K or 8700K...

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post #53 of 63 (permalink) Old 06-20-2019, 05:39 AM
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Quote: Originally Posted by Martin778 View Post
Kind of a predicatble result :-) When you test a CPU that acutally is able to transfer the heat efficiently to the haetspreader, the results will change significantly. (I'm looking at you, Intel - with stock vs direct die temp differences of 20c!). That's the main reason I skip reviews when they use a non-delidded 7700K or 8700K...
Anytime we see test results in degrees with no reference to air temp going into cooler we have to take that results with a heavy dose of salt.



This is even more true when those results include CLCs mounted as intake while air coolers are in middle of case usually wihtout near enough case airflow to supply them with air that is only 5c above room temp .. often it's 10c difference or more and every degree warmer the air into cooler is translates into almost exactly the same number of degrees hotter CPU is.



So a CLC mounted as intake giving a CPU temp of 65c while an air cooler mounted on CPU using 10c warmer air will be 75c when both air cooler and CLC are removing exactly the same amount of heat from CPU.

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post #54 of 63 (permalink) Old 06-23-2019, 11:43 AM
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Shouldn't test with PBO. PBO maximizes the CPU power until it hits the limit as long as temperature is below threshold.


If you're testing cooler performance you really need a fixed clockspeed and fixed voltage with a consistent repeatable load.

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post #55 of 63 (permalink) Old 06-24-2019, 03:06 AM
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Quote: Originally Posted by doyll View Post


This is even more true when those results include CLCs mounted as intake while air coolers are in middle of case usually wihtout near enough case airflow to supply them with air that is only 5c above room temp .. often it's 10c difference or more and every degree warmer the air into cooler is translates into almost exactly the same number of degrees hotter CPU is.

So a CLC mounted as intake giving a CPU temp of 65c while an air cooler mounted on CPU using 10c warmer air will be 75c when both air cooler and CLC are removing exactly the same amount of heat from CPU.
tuff - that is what happens when you use an air cooler. You are at the mercy of the internal case temp which is a major downside of an air cooler. of course if you actually use an open air test bench rather than a case it isn't an issue is it.
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post #56 of 63 (permalink) Old 06-24-2019, 04:36 AM
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Quote: Originally Posted by poah View Post
tuff - that is what happens when you use an air cooler. You are at the mercy of the internal case temp which is a major downside of an air cooler. of course if you actually use an open air test bench rather than a case it isn't an issue is it.
More from the great poah .. is that just more poah to step in?

With a decent case setup with decent fans there is no downside.
Case with good fans flow air at or near room temp to components cooling as well or better than as well as quieter than CLCs .. and are much more dependable as well as lower priced .. meaning air cooling is clearly the choice of informed buyers.

A test bench is just that, a test bench.

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post #57 of 63 (permalink) Old 06-24-2019, 04:45 AM
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Quote: Originally Posted by doyll View Post
More from the great poah .. is that just more poah to step in?

With a decent case setup with decent fans there is no downside.
Case with good fans flow air at or near room temp to components cooling as well or better than as well as quieter than CLCs .. and are much more dependable as well as lower priced .. meaning air cooling is clearly the choice of informed buyers.

A test bench is just that, a test bench.
But....but.....that would require setting up airflow correctly....that would be so hard and take moments of planning.....the other components in the system don't need cooling or airflow.....I wuv my Asetek.....

[img]https://media.giphy.com/media/14rc78gHGGXIFq/giphy.gif[/img]

Yeah....the little girl hentai avatar is really creeping me out....

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post #58 of 63 (permalink) Old 06-25-2019, 12:58 AM - Thread Starter
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Quote: Originally Posted by AlphaC View Post
Shouldn't test with PBO. PBO maximizes the CPU power until it hits the limit as long as temperature is below threshold.


If you're testing cooler performance you really need a fixed clockspeed and fixed voltage with a consistent repeatable load.
That makes a lot of sense.
Friday when I received the noctua I've made some tests, with H115i PRO before dissasemble I got 67º max temp on realbench.
30 minutes later, with NHU12A, got 74º on max temp with same test.
At first I was thinking about thermal paste, just need time to sit down, but, heatsink was really "hot" so thermal-conductivity was working good.
Maybe PBO was reaching higher than with CLC, I dont know now, but 100% agree that test should have been made with fixed voltage/freqs, now it's to late.
But I'm happpy with the change, NHU12A is not as big as I thought and its working pretty well and silent, so it's OK, but I'll keep in my mind that H115i PRO was performing better, louder, but better.
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post #59 of 63 (permalink) Old 06-25-2019, 02:21 AM
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Quote: Originally Posted by rul3s View Post
That makes a lot of sense.
Friday when I received the noctua I've made some tests, with H115i PRO before dissasemble I got 67º max temp on realbench.
30 minutes later, with NHU12A, got 74º on max temp with same test.
At first I was thinking about thermal paste, just need time to sit down, but, heatsink was really "hot" so thermal-conductivity was working good.
Maybe PBO was reaching higher than with CLC, I dont know now, but 100% agree that test should have been made with fixed voltage/freqs, now it's to late.
But I'm happpy with the change, NHU12A is not as big as I thought and its working pretty well and silent, so it's OK, but I'll keep in my mind that H115i PRO was performing better, louder, but better.
Thanks for sharing your results. Your build is super clean, looks great!.

Did you switch back to NH U12s?

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post #60 of 63 (permalink) Old 06-25-2019, 02:38 AM - Thread Starter
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Quote: Originally Posted by Ashura View Post
Thanks for sharing your results. Your build is super clean, looks great!.

Did you switch back to NH U12s?
Nope, my previous heatsink was a NHU12P, I've sold it and buy a NHU12A, the one you see on the pic.

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