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Noctua NH-D15 Club - Page 8

post #71 of 1553
Quote:
Originally Posted by doyll View Post

Most reviewers use case systems to test in with room ambient as base temp, but do not monitor cooler intake air temp rolleyes.gif
Room temperature is really worthless. It's the temperature of air going in to cooler that is important, not what the room temperature is. rolleyes.gif
Their tests results are how well their system is cooling in their room.
I don't have their system or their room.
I could care less how well their system cools.
I want to know how well the cooler being tested cools.

Just changing coolers in a system usually changes the case airflow and therefor cooler intake air temp... Changing cooler fans does too. wink.gif

You are overstating that effect quiet a bit though i would say. It's just one of many factors that makes cooler testing very tricky and vague in general.
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post #72 of 1553
Quote:
Originally Posted by Elohim View Post

You are overstating that effect quiet a bit though i would say. It's just one of many factors that makes cooler testing very tricky and vague in general.
I don't think I am. Mostly because it is a large variable that can easily be removed from the list of many tricky and vague factors. This one variable would make a big difference, but that's only my opinion.
post #73 of 1553
Quote:
Originally Posted by Kip69 View Post

You are right. Darn typo. 15. I mean D15
If you can do a direct comparison to the D14 using the same fans!
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post #74 of 1553

I used to measure ambient temps at the heatsink intake. However, I stopped doing that when when I was testing the Noctua NH-L12. I found wildly varying net temps. But when I looked at the results, I was getting consistent top temps. It was the ambient that was all over the map. Since I was comparing it with the NH-D14, I looked at the ambients at the intake for that as well. I was unhappy with the variance. Now I measure ambient temps in true ambient -- hanging down from my workbench. I am much happier with the consistency I get.

 

No longer do I trust ambient temps measured at the heatsink's input.

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post #75 of 1553
Quote:
Originally Posted by ohhgourami View Post

If you can do a direct comparison to the D14 using the same fans!

Oh. That is a good sugestion. Unfortunately, I have only a NH-U12S and NH-U14S (using the NH-U14s right now, its great, but as I have that great Samsung low profile ram, not the best choice smile.gif

I'll try to trade to get a D14 for, say a NH-U12S? thumb.gif Good idea.
 
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post #76 of 1553
Quote:
Originally Posted by Kip69 View Post

Oh. That is a good sugestion. Unfortunately, I have only a NH-U12S and NH-U14S (using the NH-U14s right now, its great, but as I have that great Samsung low profile ram, not the best choice smile.gif

I'll try to trade to get a D14 for, say a NH-U12S? thumb.gif Good idea.

Seeing that you got a 3930K, lovely but could you please compare it with prime95? So take small FFT's, then select custom and use for the min & max FFT 16 and use 20mins for each FFT. Just to have more accurate results
post #77 of 1553
Quote:
Originally Posted by Faithh View Post

Seeing that you got a 3930K, lovely but could you please compare it with prime95? So take small FFT's, then select custom and use for the min & max FFT 16 and use 20mins for each FFT. Just to have more accurate results

You got it. That is exactly what I need to know to look for thumb.gif
 
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post #78 of 1553
Quote:
Originally Posted by ehume View Post

I used to measure ambient temps at the heatsink intake. However, I stopped doing that when when I was testing the Noctua NH-L12. I found wildly varying net temps. But when I looked at the results, I was getting consistent top temps. It was the ambient that was all over the map. Since I was comparing it with the NH-D14, I looked at the ambients at the intake for that as well. I was unhappy with the variance. Now I measure ambient temps in true ambient -- hanging down from my workbench. I am much happier with the consistency I get.

No longer do I trust ambient temps measured at the heatsink's input.
With that logic if the CPU readings were not to our liking we could monitor the temp of something else instead.. rolleyes.gif

The reason the NH-L12 intake temps were varying so much is because the cooler was circulating it's own heated exhaust back into it's intake. Common problem with down flow / pancake coolers. The cooler exhaust is deflected out by motherboard, back up around cooler by RAM, GPU, I/O housings, etc, and is drawn in by cooler intake fan.

Reversing the fan and drawing air away from motherboard with this style cooler usually results in lower CPU and motherboard component temps.
Edited by doyll - 4/21/14 at 12:15am
post #79 of 1553
I have an old NOCTUA SE1366 NH-U12P on my i7920 - couldn't be any more happier. Great products thumb.gif
post #80 of 1553
Quote:
Originally Posted by doyll View Post
 
Quote:
Originally Posted by ehume View Post

I used to measure ambient temps at the heatsink intake. However, I stopped doing that when when I was testing the Noctua NH-L12. I found wildly varying net temps. But when I looked at the results, I was getting consistent top temps. It was the ambient that was all over the map. Since I was comparing it with the NH-D14, I looked at the ambients at the intake for that as well. I was unhappy with the variance. Now I measure ambient temps in true ambient -- hanging down from my workbench. I am much happier with the consistency I get.

No longer do I trust ambient temps measured at the heatsink's input.
With that logic if the CPU readings were not to our liking we could monitor the temp of something else instead.. rolleyes.gif

The reason the NH-L12 intake temps were varying so much is because the cooler was circulating it's own heated exhaust back into it's intake. Common problem with down flow / pancake coolers. The cooler exhaust is deflected out by motherboard, back up around cooler by RAM, GPU, I/O housings, etc, and is drawn in by cooler intake fan.

Reversing the fan and drawing air away from motherboard with this style cooler usually results in lower CPU and motherboard component temps.


While I agree with you on that, my further explorations led me to separate my USB thermometer's temp-reading head as far from heatsinks as possible.

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