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Noctua NHU-P12 SE2 with Kaze 3000RPM

post #1 of 8
Thread Starter 
Hi guys! It's been a while since I posted something.

Recently I upgraded my system and got the cooler in the title with the 2 stock Noctua fans at 1200RPM.

Having the old Thermalright TRUE with 2x Kaze 3000RPM left, I decided to see if the two Kazes would provide better cooling since I wasn't so happy with the temps I had at 4.5Ghz.

Bellow are the test results and some photos.

Test setup:

Prime95 SmallFFT for 5-6 minutes
Ambient temp: 25-26C

Results:

Stock Noctua Fans @ 1200RPM
Idle - 45C (in the screen shot the idle temps were higher than what I normally get)
Load - 76C

Ultra Kaze 3k Fans @ 2000RPM
Idle - 37C
Load - 72C

Ultra Kaze 3k Fans @ 1800RPM push & 1200RPM pull
Idle - 37C
Load - 74C

I have reduced temps by ~4C by changing the fans, however, I noticed a weird whistle coming from the pull fan, probably due to the construction of the cooling tower. If I hold my hand on the lower part of the fan, towards the motherboard, the whistle goes away.
It starts to become noticeable at ~1400RPM. Tried adjusting the fan to a lower/higher position but it doesn't help, neither does adding spacers to the fan to be further away from the tower.
Now it stays at 1800RPM for the push fan and 1200RPM for the pull fan.

Overall I am satisfied with the results, but bummed because of the whistle effect the pull fan has over 1400RPM. I did not have this problem with the old Thermalright tower.

Hope you guys enjoyed the tests and results.









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post #2 of 8
Interesting. Expect that 2-4 degree improvement was accompanied loudly by a 15-20dB noise increase. Over twice as loud for a couple degrees isn't the tradeoff I'd make. The CPU can take the heat, my ears, not so much.

The bonus whistle effect is likely a result of a mismatch of designed flow rate of the U12 versus the turbulent tornado of twin Kaze screamers. If you can stop the whistling by putting your hand near the lower part of the fan, should be able to create a similar effect with a DIY baffle made from craft foamboard and duct tape. Duct tape fixes everything.

What is your ambient temp and the temp at the cooler intake? If you haven't used one, a cheap indoor/outdoor thermometer can help optimize case airflow as per doyll's how-to.
post #3 of 8
Thread Starter 
Quote:
Originally Posted by MicroCat View Post

Interesting. Expect that 2-4 degree improvement was accompanied loudly by a 15-20dB noise increase. Over twice as loud for a couple degrees isn't the tradeoff I'd make. The CPU can take the heat, my ears, not so much.

The bonus whistle effect is likely a result of a mismatch of designed flow rate of the U12 versus the turbulent tornado of twin Kaze screamers. If you can stop the whistling by putting your hand near the lower part of the fan, should be able to create a similar effect with a DIY baffle made from craft foamboard and duct tape. Duct tape fixes everything.

What is your ambient temp and the temp at the cooler intake? If you haven't used one, a cheap indoor/outdoor thermometer can help optimize case airflow as per doyll's how-to.

Actually, the two Kazes are not that loud. At 2000RPM you can barely notice the difference and at ~1600RPM its pretty much the same. Max speed they are horrible tho but won't go above 2700RPM anyway. Cant imagine how 3000RPM fans sound ...
I'm not sure a DIY baffle would be very helpful to the life of the Kaze, as it would create unbalance to the axis and drag and the looks would kill it for me from the start. I have settled with 1200RPM for the pull fan, which is basically at the same level as the old Noctua fan and 1800RPM for the push fan. To my ear this config is pretty much the same noise as it was before, maybe a tiny bit louder if you listen carefully.

Ambient temps were 25-26C. I don't imagine the temps at the cooler Intake were much off giving the config with the front fan supplying air. In between the front intake fan for the CPU and the first Kaze, you can feel a lot of air being moved and supplied to the Kaze, which comes almost directly from the outside. I find this current setup to be perfect for airflow and quick in and out air movement. Right now I have the whole case on a positive pressure to keep as much dust out as possible.

Thanks for the link to doyll's guide!
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post #4 of 8

Those Ultra Kaze fans. I love them, but I'm getting rid of mine. You have two NF-P12's. Put them back on and enjoy the quiet. Oh, and thanks for sharing your results. +rep.

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post #5 of 8
Thread Starter 
Quote:
Originally Posted by ehume View Post

Those Ultra Kaze fans. I love them, but I'm getting rid of mine. You have two NF-P12's. Put them back on and enjoy the quiet. Oh, and thanks for sharing your results. +rep.

They are pretty good. Even at 1200RPM they provide better cooling. The best part is for benching and stress testing is where they shine vs the Noctua fans. I did some testing with better ambient temps (about 22-23c) with both fans at 2500RPM and didn't break 71c in intel burn test at very high after 5 runs. Sound is horrible at that RPM but bellow 1800RPM I can't notice the difference.
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post #6 of 8
I love those Ultra Kazes. I can actually stomach them at full speed. More so than say a TY-143 or a FF5-120. And they push lots of air, even when behind a couple of filters. They still remain strong even when lowered to about 1200rpm. Unfortunately Scythe seemed to have lots of QC issues with them. A couple I got from a vendor in the U.S have this horrible and annoying ticking sound (more like scrapping) that is even noticeable at low speeds. Only one of all my Kazes does not have any tonality issues. If you hunt for reviews you can see this as well.
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post #7 of 8
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Quote:
Originally Posted by Melcar View Post

I love those Ultra Kazes. I can actually stomach them at full speed. More so than say a TY-143 or a FF5-120. And they push lots of air, even when behind a couple of filters. They still remain strong even when lowered to about 1200rpm. Unfortunately Scythe seemed to have lots of QC issues with them. A couple I got from a vendor in the U.S have this horrible and annoying ticking sound (more like scrapping) that is even noticeable at low speeds. Only one of all my Kazes does not have any tonality issues. If you hunt for reviews you can see this as well.
Yes, these Kazes have a some issues. After being in the closet for a while, one of them had this rattle/clicking sound as well as screeching which really took me by surprise because it was fine when I took it down but this can easily be rezolved by greasing them. I took it apart and applied some sillicon grease after cleaning it and now it seems fine.
I don't know how you can live with them at max speed. For me 2000RPM is the upper limit.
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post #8 of 8

Eh. I agree with the QC issues. Once I opened a UK and found it dry. I would recommend on all UK's to open the lubricant area of your sleeve bearing fans to check for oil. See the 3d item in my sig for a photo essay.

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