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Noctua NH-D15 Club - Page 108

post #1071 of 1424
Hi guys, so I added a NF-A14 to the NH-U14S to do a push pull configuration. Noctua also told me to get the NF-A14 to match the 1500rpm of the original NF-A15. I used the same mounting wire. It just got tighter. To use the ziptie I would have to drill holes in it, because the holes don't match the tower.

But the dual fan configuration is giving me a noise like those water pumps that comes defective. High pitch, but not that close to coil wine. Even at idle, but you have to come close to listen to it. I also tested with the noise adaptor on the second fan (could be the voltage of the two combined) and it did not change a bit. With the stress test the whine gets pretty annoying. Both fans have rubber pads and I touched them and they are not vibrating or loose. Both seem to be well centered. The tower wobble in a very tight (slight) cycle, but I assume this has to do with the pressure from the fans. I pressed with my fingers to stop the wobble and the noise did not stop or changed.

Is one of the fans (or both) defective or this is a common anomaly? I did not like the sound of the single NF-A15 with the stress test, sounded slightly unbalanced, with a hard noise from the fan.

I also bought a Corsair SP120 High Performance Edition to be an exhaust and it is a real blower and I can feel the noise as only air and drag. It sounds perfectly balanced. In fact, really nice fan. Not the same experience that I am having with the Noctua's.

Do I have to test both NF-A14 and NF-A15 separately on a 3 pin connector to see how they fare in open air? If they present some weird noise at high rpm? Do the NH-U14S or Noctua has a troubled history with push pull?
post #1072 of 1424
Here's the setup:



Ps: I know, I gotta replace the white rims from the top fans biggrin.gif
post #1073 of 1424
OK, I found about the spacers on the NF-A15 (thought they were spare pads). Let's see if gets better. But the NF-A14 spacers won't fit in the tower.
post #1074 of 1424
Updated my build log if anyone want to see how it turned out
Project Arios / Seravee
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD40EZRX  WD Green WD60EZRX  WD Red WD80EFZX 8TB  
Hard DriveOptical DriveCoolingCooling
Seagate Ironwolf Pro 10 TB LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S 
OSMonitorMonitorKeyboard
Windows 7 64 Bit Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB 
PowerCaseMouseMouse Pad
EVGA SuperNova G2 750 watt Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor 
AudioAudioAudioAudio
Sennheiser HD 598 Onkyo TX NR646  Harman Kardon HKTS 60 Dali Opticon Vokal 
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x2 Dali Opticon 2 CableMod E series PSU cable set CableMod LED Strips 
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Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD40EZRX  WD Green WD60EZRX  WD Red WD80EFZX 8TB  
Hard DriveOptical DriveCoolingCooling
Seagate Ironwolf Pro 10 TB LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S 
OSMonitorMonitorKeyboard
Windows 7 64 Bit Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB 
PowerCaseMouseMouse Pad
EVGA SuperNova G2 750 watt Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor 
AudioAudioAudioAudio
Sennheiser HD 598 Onkyo TX NR646  Harman Kardon HKTS 60 Dali Opticon Vokal 
AudioOtherOther
x2 Dali Opticon 2 CableMod E series PSU cable set CableMod LED Strips 
  hide details  
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post #1075 of 1424
Now I did a thorough test with the fans that I have with the case closed horizontally.

The NF-A15 continues to whine with the spacer. Did not make a single wave in the pitch.

The SP120 Performance Edition cuts the whine in half when working together with the NF-A14. I assume both Noctua's are not getting along together. If I add another SP120 the whine will likely disappear.

The SP120 Performance Edition (not PWM version) alone is slightly better than the NF-A15 alone. Some 1.5-2ºC. I imagine the NF-A15 will catch-up a degree at 1500rpm (it ran at 1350rpm). I don't have a test bench so it is hard to put your hand below the top of the heatsink, but looks like the 120mm fan exploits all the air through the fins, while the 140mm fan wastes some from the top and the side of the heatsink. And the SP120 has more static pressure (it was around *2250rpm). Not that noisy like I would expect from a 2350rpm fan. But I would obviously run a pair of PWM ones.

I tested the NF-A15 on a 4 pin header and it is running fine. I did not test the NF-A14 because they both seems fine. The SP120 also makes a hard noise on the heatsink. They both fare about equal on the heatsink pitch.

Corsair gained some leeway with me. I will most likely buy two SP120 with PWM to run with my NH-U14S. And it looks cool with a red ring in front of my red memory (forgot to take a picture).

Well, thanks for all the help guys. In case I add a pair of 120mm and they also whine I'll drop a note here.

Peace,
Edited by Contiusa - 2/12/16 at 8:59pm
post #1076 of 1424
Have you made an audio or a video with audio of the various fans? By the description, one or more of the Nocs may have a defect. Mine don't whine, but whoosh.

But, if the SP120s work for you, that's great. Not my first choice in 120mm fans, that would be the Darkside PWM GTs or EK Vardars,

Oh...3 pin SP120 quieter than PWM A14/A15, is that right? Possibly there's a PWM controller issue in your system. Is the MB set to run the cpu header in PWM mode? Have you set your own fan profiles?
post #1077 of 1424
Quote:
Originally Posted by MicroCat View Post

Have you made an audio or a video with audio of the various fans? By the description, one or more of the Nocs may have a defect. Mine don't whine, but whoosh.

But, if the SP120s work for you, that's great. Not my first choice in 120mm fans, that would be the Darkside PWM GTs or EK Vardars,

Oh...3 pin SP120 quieter than PWM A14/A15, is that right? Possibly there's a PWM controller issue in your system. Is the MB set to run the cpu header in PWM mode? Have you set your own fan profiles?

No, not quieter smile.gif but it has less whine making a duo with another Noctua. What I said is that the SP120 is quieter than I thought a 2350 fan would be, but it certainly makes more noise than the Noctua. But not what I imagined, since it runs 750-800rpm higher. On this regard it surprised me. But if I get PWM ones they will certainly be inaudible in most cases.

From what I am seeing in the Brazilian market, so far I have the option of the SP120, Cougar Vortex and Sickleflow. I might find one or two other options down the line. The latter two are pretty cheap. Maybe I'll by a pair of the Sickleflow to make a test. I saw a review and looks like the Blade Master 120 is pretty good (http://www.vortez.net/articles_pages/120mm_and_140mm_fan_comparison,17.html), but I don't see it for sale here. But Cooler Master is pretty popular in Brazil, so maybe I'll wait a bit. The Corsairs are expensive and are sold out right now, but they come around all the time.
post #1078 of 1424
Ok, thanks for clearing that noise up. ;-)

But, until you can SP120 PWM versions, the whine might be a PWM issue with the system. If you run the Noctuas in voltage control mode, not PWM, is the whine the same or is it reduced?
post #1079 of 1424
Quote:
Originally Posted by MicroCat View Post

Ok, thanks for clearing that noise up. ;-)

But, until you can SP120 PWM versions, the whine might be a PWM issue with the system. If you run the Noctuas in voltage control mode, not PWM, is the whine the same or is it reduced?

That could be the case. I did all the tests with the PWM, although I tested the NF-A14 with LNA (to replicate what Noctua imposed with the NF-A15 1200rpm). The whine remains the same.

But I'll test them both with voltage control tomorrow, most likely. I'll let you know the result.
post #1080 of 1424
Contiusa
Your top case fans are most likely increasing our CPU temps when GPU is working. wink.gif They are drawing it's heated exhaust up into your U14S intake airflow.

Easy way to find out is unplug them, especially the front one, and see if temps change.
I also suggest removing all unused PCIe slot covers for better front to back airflow.
If your motherboard has a good lower graphics card socket, moving your GPU down will likely lower temps too.
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