Noiseblocker NB-eLoop 120mm fans

Control: management of fans, temp/rpm monitoring via soft/hardware

Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee

Koldun
Posts: 41
Joined: Sun Aug 05, 2012 11:58 pm

Re: Noiseblocker NB-eLoop 120mm fans

Post by Koldun » Tue Oct 02, 2012 10:47 pm

boost wrote:The review on OC.net isn't ideal because these fans are strictly single purpose push fans. As soon as there is something disturbing airflow less than 1cm in front of the fan, like a fan grate, a dust filter or a heatsink they can drone. If used in a push configuration I found you can run them ~300RPM faster than other fans at the same noise level.
This information is from the German forum hardwareluxx where the manufacturer answers user questions.
How exactly is that feasible, though? I can't put it as a front intake because the dust filters/hdds will cause it to drone, and I can't put it as a cpu fan because the heatsink will cause it to drone. Also, I don't really want to have an intake fan without a dust filter because I'm lazy and I don't want to be cleaning dust off the inside of my computer every 2nd week. Any other places these can be used?

gabedamien
Posts: 24
Joined: Thu Jun 21, 2012 8:51 pm

Re: Noiseblocker NB-eLoop 120mm fans

Post by gabedamien » Wed Oct 03, 2012 8:15 pm

Koldun wrote:
boost wrote:The review on OC.net isn't ideal because these fans are strictly single purpose push fans. As soon as there is something disturbing airflow less than 1cm in front of the fan, like a fan grate, a dust filter or a heatsink they can drone. If used in a push configuration I found you can run them ~300RPM faster than other fans at the same noise level.
This information is from the German forum hardwareluxx where the manufacturer answers user questions.
How exactly is that feasible, though? I can't put it as a front intake because the dust filters/hdds will cause it to drone, and I can't put it as a cpu fan because the heatsink will cause it to drone. Also, I don't really want to have an intake fan without a dust filter because I'm lazy and I don't want to be cleaning dust off the inside of my computer every 2nd week. Any other places these can be used?
If you want to strictly avoid using them in a pull configuration, you can use them as CPU push or as case exhaust. Or, like me, as an intake fan that is somewhat at a distance from the intake filter. When Koldun wrote "in front of the fan" he meant it in terms of airflow, i.e., something blocking the intake side.

UPDATE:

So I installed Windows 7 and used Fan Xpert 2 to get fine control. I also tested the pull fan specifically to see if I could isolate the drone noise. Here are my results.
.:.
  • Bottom intake B12-PS (angled, somewhat at a distance from a dust filter):
    RPM: 382-1387. Top speed is a bit low for some reason.
    Noise: somewhat higher pitched than the others. Still OK. No drone.
  • Bottom intake / half-push M12-PS (angled, somewhat at a distance from a dust filter, aimed at CPU heatsink):
    RPM: 610-1477
    Noise: an extremely pleasant low whoosh. No issues whatsoever.
  • Top B12-PS exhaust fan (with wire grill on exhaust side)
    RPM: 483-1581 (note: high min RPM compared to spec 400 *may* be due to airflow from other fans, or something to do with the header; I didn't test this).
    Noise: quiet even at relatively high RPMs. Agreeable quality, though higher pitched than M12-PS. Subtle motor tick at extremely close distances.
  • Top GPU M8-P exhaust fan (very steeply angled, aimed practically at a side panel - this is an odd bracket)
    RPM: 372-2125
    Noise: very quiet up to about 1250 RPM. At high RPM, the noise becomes fluttery and uneven, with a bit of a windy quality. However, this fan is mounted in an very unusually-oriented bracket right next to a panel and may or may not be doing anything useful, so this isn't a fair test.
Here we come to the fly in the ointment:
  • CPU pull-side B12-PS fan.
    RPM: ~400 to ~1500 (I tested it, but stupidly forgot to mark it down; however, it definitely got down to something close to the official spec).
    Noise: ouch. I can now confirm, quite definitely, that these fans do NOT work well as pull fans. At anything above 550 RPM or so, a weird drone noise was heard, faint at first but becoming quite obvious by 900 RPM. It sounds almost exactly like whistling and humming at the same time (not my video). It isn't just an interference at specific RPMs, it is constant and scales dramatically with RPM to the point of being quite blatant and high-pitched at max RPMs.
Apart from that issue and the cost issue, this fan is great. I am very happy with the performance and the super-low RPM noise (or lack thereof), as well as the modular cables, open corners, integrated cushioning, mount design, wide PWM range, and horizontal usage rating. But I admit the M12-PS is a noticeably better fan for sound quality, even if the B12-PS is more than competitive on a sound level (per RPM) front.

That pull drone, however, is a real downer. It also puts me in a bit of a quandary; my heatsink fan clips require open corners, which my M12-PS doesn't have. I actually have a set of fan shrouds built for this heatsink, which could mount the M12-PS (letting me swap it with the B12-PS), but the problem is the M8-P in the GPU exhaust bracket practically doesn't fit already, it's so smashed up against the side of the heatsink - it definitely won't fit with the shroud on. I could remove it, since it arguably isn't helping much anyway, except with my non-reference graphics card cooler design, I would rather keep it in if possible. I also bought the dang thing and bent a fan clip to fit it in there, so I'm feeling stubborn about it.

Probably at some point I will remove it though, and swap the M12-BS and B12-PS positions.

pet
Posts: 34
Joined: Fri Jun 03, 2011 7:35 am

Re: Noiseblocker NB-eLoop 120mm fans

Post by pet » Thu Oct 04, 2012 7:50 am

Thanks for the detailed report!

I think this is the kind of info that's really hard to find and makes spcr stand out :D

fuzzymath10
Posts: 69
Joined: Tue May 03, 2011 5:52 pm
Location: Toronto

Re: Noiseblocker NB-eLoop 120mm fans

Post by fuzzymath10 » Thu Oct 04, 2012 8:20 am

I think this highlights how important it is to test fans in multiple environments. I have the 1450rpm GTs, and in most configurations I got the buzzing on undervolting as per the SPCR review. Then I tried it as an exhaust (through a tight grille), and with careful mounting, it finally stopped buzzing, and performs very well (certainly compared to my Sflex and Noctua fans which struggled with the tight grille).

I'm in another thread about Noctua being overrated, and this I think is one of their strengths, at least with the handful of fans I'm using; they're not picky about orientation, and sound/perform equally good/bad in all applications, and without requiring care in mounting. They are not tempermental. Other fans will perform better if tuned/applied properly.

AckeDman
Posts: 150
Joined: Wed Apr 02, 2008 12:20 am
Location: Sweden

Re: Noiseblocker NB-eLoop 120mm fans

Post by AckeDman » Fri Jul 04, 2014 10:12 pm

I made the misstake of ordering 3 of the elop B12-PS series because i forgot i had a bad experience with the 800rpm version. These fans are catastrophic. There is a audible buzzing noise that isn't just airflow being pushed. It is noticible even at 700rpm :( :( :( :( :( :( :( :(

Wild Penguin
Posts: 83
Joined: Mon Jul 01, 2013 3:30 pm

Re: Noiseblocker NB-eLoop 120mm fans

Post by Wild Penguin » Sat Apr 04, 2015 12:05 pm

I bought two B12-3's because of the good reviews and availabality.

I have to comment here since I'm deeply disappointed in the fans :evil:

Both fans cause a terrible drone at even a very low speed. At first I though the fans are faulty, and decided to return them. But then I tried them outside the case, and they sound fine. So, I conclude the fans are OK, but it seems I'm just unlucky - the fan grill in my Antec Fusion is incompatible with them, and a severe (yes, that is the right adjective for the issue) turbulence / resonance issue appears.

I'd like to and tried to run them as exhaust, but I also tried them as intake (so the grill is "before" the airflow). In that configuration, the drone is even worse. A lower pitch, but much more annoying (as exhaust, the pitch is around 388Hz - I measured by comparing to a sine wave - slightly changing by the RPM).

They are inusable in my Antec Fusion (for a quiet setup that is). Anyone want to buy two B12-3's?

Post Reply