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Bitspower Njord Dual Fin dRGB Fan

VSG

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After testing Bitspower's value-oriented Touchaqua NJORD fans, we shift over to the more featured Njord Dual Fin fans. These come in two color options, offer niftier RGB lighting via the dual-fin rotor design, and have daisy-chained cable management that suits radiator fan placement, too.

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I have a question, the fans are rated at 1800rpm. If you apply the +/- 50 rpm shouldn't the full speed results get it into the 1850rpm graph? As it sits the review clips off the the full speed results. The fan definitely is meant to compete against other 1800rpm range fans.

Just a curiousity on a otherwise good review.
 

VSG

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I have a question, the fans are rated at 1800rpm. If you apply the +/- 50 rpm shouldn't the full speed results get it into the 1850rpm graph? As it sits the review clips off the the full speed results. The fan definitely is meant to compete against other 1800rpm range fans.

Just a curiousity on a otherwise good review.
So many fans just don't cross 1500 RPM these days to where I decided to just stop at this point, especially for watercooling
 
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Isn't 1.8 mm H₂O a bit low for fans being used on a radiator?
It's fine for general case fan usage.
 

VSG

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Isn't 1.8 mm H₂O a bit low for fans being used on a radiator?
It's fine for general case fan usage.

It is on the lower side of advertised numbers, but take these with a grain of salt. I can count on the fingers of one hand the number of companies that have proper in-house testing facilities for airflow and noise.
 
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It is on the lower side of advertised numbers, but take these with a grain of salt. I can count on the fingers of one hand the number of companies that have proper in-house testing facilities for airflow and noise.

I have a friend missing two fingers, as he worked in metalworks... I bet he can count them too...
 
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So many fans just don't cross 1500 RPM these days to where I decided to just stop at this point, especially for watercooling

Oh ok, for me and my love of the 18-1900 rpm fans is a bit sad. I do understand though, making a quiet 1500rpm fan is much easier than a 1850rpm one. The noise spike when crossing 2000rpm is real.

Though I'm a monster who has his sweet DS-GT 1850s running at 3V at idle.

Could you try testing the fans in voltage control and see where they'll keep spinning? It's actually a very good test that separates lousy bearings and bad motors from excellent bearings and motors.

My NF-P12s won't keep themselves going about 3 volts, while my Darkside Typhoons will keep rotating. Then again a monster who volt controls a few PWM fans because better control and the PWM does annoying pulse steps when ramping. I have some weird Enermax fans that are absolute trash on voltage control, they are super long life sleeve type, and stall at 7V but at below 10% PWM they spin up to 100%. :-|

Thanks for the reply!
 
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If these were priced around $20/fan they would be a good value, especially for people seeking RGB for their builds.

If I snagged some for free or they were included with a chassis I could see myself using them.
 
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Wow, that is a riduculous and terrible design; Truly an example of form over function.

As far as I can tell, this chunky RGBLED plastic frame just makes the fan smaller. This would appear to be a 105mm fan in a 120mm frame. No wonder it can't compete with any 120mm fans, it's not a 120mm fan :laugh:
 
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Wow, that is a riduculous and terrible design; Truly an example of form over function.

As far as I can tell, this chunky RGBLED plastic frame just makes the fan smaller. This would appear to be a 105mm fan in a 120mm frame. No wonder it can't compete with any 120mm fans, it's not a 120mm fan :laugh:

Did... did you read the review? This fan takes a pretty clear second place among RGB fans in terms of airflow to noise ratio, behind only the excellent ML120 Pro RGB and ahead of the Vardar EVO 120ER RGB.

1588171470588.png

1588171489253.png


Now I want to know if it's possible to get the vanilla Njord impeller into this frame and see how it performs. I expect a lot of its "deficiencies" (in quotes because it's still tied for third best RGB fan in the batch) are the result of a frame that doesn't seal well against a radiator.

Thanks for the review, VSG!
 
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VSG

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Oh ok, for me and my love of the 18-1900 rpm fans is a bit sad. I do understand though, making a quiet 1500rpm fan is much easier than a 1850rpm one. The noise spike when crossing 2000rpm is real.

Though I'm a monster who has his sweet DS-GT 1850s running at 3V at idle.

Could you try testing the fans in voltage control and see where they'll keep spinning? It's actually a very good test that separates lousy bearings and bad motors from excellent bearings and motors.

My NF-P12s won't keep themselves going about 3 volts, while my Darkside Typhoons will keep rotating. Then again a monster who volt controls a few PWM fans because better control and the PWM does annoying pulse steps when ramping. I have some weird Enermax fans that are absolute trash on voltage control, they are super long life sleeve type, and stall at 7V but at below 10% PWM they spin up to 100%. :-|

Thanks for the reply!

Is it really a good test to operate PWM fans under voltage though? Some bearings, such as Sunon's magnetic levitation bearings, have to operate at 12 V or near-about to get the effect.
 
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Is it really a good test to operate PWM fans under voltage though? Some bearings, such as Sunon's magnetic levitation bearings, have to operate at 12 V or near-about to get the effect.

Yea no use. Voltage control is not really the holy grail. He has a coincidence with lower voltage the switching noise becomes more silent too as the amplitude gets smaller obviously.

Well I have to admit that there are really badly designed motor drivers. Nidec one is trully a great one. You have to take apart the cover and measure what is really electrically happening there. Yea... it sucks.

And for example, take Sunon maglev and put a 100uF capacitor across the 12V line directly at the point where wires are soldered(I put a slim tantallum usually). I put them in power supplies, and those are voltage controlled and got noise issues at idle low RPM(Volts). And run it from 5V and up with and without the cap. It will tame down the motor noise as the shape and slope of the controlling motor PWM will get as it should be from a triangle, saw like shape to meander. Well just for the lulz... you know isolation boredom...
 
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Is it really a good test to operate PWM fans under voltage though? Some bearings, such as Sunon's magnetic levitation bearings, have to operate at 12 V or near-about to get the effect.

Honestly Sunon mag levs are kinda rare and there are ones that can be run under voltage control. Usually they state it as the start up voltage. But yes mag levs can be fussy. They are kind of the exception as most either run some variation/combination of sleeve, sealed sleeve(FDB), or ball.

I know they actually bin fan motors based on the speeds they run. It's one of the reasons higher speed versions of exactly the same fan(besides max speed) tend to cost more.

Yea no use. Voltage control is not really the holy grail. He has a coincidence with lower voltage the switching noise becomes more silent too as the amplitude gets smaller obviously.

Well I have to admit that there are really badly designed motor drivers. Nidec one is trully a great one. You have to take apart the cover and measure what is really electrically happening there. Yea... it sucks.

And for example, take Sunon maglev and put a 100uF capacitor across the 12V line directly at the point where wires are soldered(I put a slim tantallum usually). I put them in power supplies, and those are voltage controlled and got noise issues at idle low RPM(Volts). And run it from 5V and up with and without the cap. It will tame down the motor noise as the shape and slope of the controlling motor PWM will get as it should be from a triangle, saw like shape to meander. Well just for the lulz... you know isolation boredom...

I was more in line with you don't always have PWM to control these fans and it's good information to have. There are many where the PWM version is superior. Guess it's a question of if it's an easy thing to test on his fan controller. On my Aquero 6, I could test minimum voltage in under a minute easily.

That's actually really interesting. It's like why they add a capacitor to the fan in those cheap and sketchy hot air stations.

Gotta pass the time somehow, right?
 
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