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post #2171 of 2742
Quote:
Originally Posted by epic1337 View Post

right, though this reminded me, i wonder if corsair thought of making the fan with a separate power connector for the maglev.
this would allow it to run on variable voltage, and a simple Y-cable will allow it to run on PWM headers.
and on the other hand, this would allow us to "experiment" on providing more power for the maglevs, who knows maybe it can become even more quieter at 24V input.

this would add like, 50cents on the cost or probably even less, so its not that much of an issue, considering this fan is already really expensive.
It would require the fan be wired completely different with two power leads; one for maglev circuit and one for motor / PWM circuit.
Quote:
Originally Posted by Cyclops View Post

I'm not sure how this maglev minimum voltage thing is a... thing.

At full blast (2400 RPM), the fan was only using 3 watts of power which is 0.25 amp on the 12v rail. There are many many different fans that use the same amount of power to spin at a similar RPM range, sometimes even more. I don't think the maglev system is using any substantial amount of power.

Surely, if voltage control was a problem, Corsair would have said something in the user manual, specially if it would affect the operational life of the fan. This don't-use-voltage-control thingy is blown way out of proportion.
It's a 'thing' because the maglev bearing is not designed to function in near as wide a range as a variable voltage fan motor can run.

'Power' is a combination of volts and amps, not one or the other. My reference to 'power' is voltage requirement of maglev, not the amp load it uses.

This is what geggeg said in his review:
Quote:
The fans hit an average of 762 RPM at 3.6 V before shutting down, and even here it was inconsistent among the 4 samples. Restarting voltage once shut down was between 4-4.2 V for the various samples. Aside from the shorter range of operation, there are 2 other reasons why you may not want to do voltage control: (1) the LED brightness will be affected for the LED models, and (2) the MagLev bearing will not work well lower than 8-9 V with the bearing not levitating as it should. Without long term testing at lower voltages, I can’t say what the effect of this will be but I do not want to find out for myself and neither do I recommend you do so either. Please- stick to PWM control here.

(Edit: July 13, 2016- I noticed a few people misunderstanding what I meant above. The bearing suddenly does not become a sleeve bearing and be prone to issues under voltage control. Sleeve bearings also are not a particular item that goes bad at a particular time but that’s a discussion for another time. I am trying to refrain people from using voltage control here as the electromagnetic field generated that helps levitate the bearing will be powered via a constant 12 V when using PWM control. If using voltage control, the strength of said field will change and effect the nature of the fan. Given this is advertised as a PWM fan, I am reviewing it as such and so I have no issues with any potential issues under voltage control. Neither should you. If you use voltage control for whatever reason despite my recommendations, please try to stick to 8-12 V or so. I went even below and found no audible issues even till 5 V but again I do not recommend it.)
To put it simply using variable voltage lower than 8-9 V does not supply the maglev bearing with high enough voltage for it to function as designed.
Edited by doyll - 7/23/16 at 5:51am
post #2172 of 2742
So in other words the test of the MagLev fans will not be exactly accurate for noise at low speeds using voltage control it has to be redone with PWN control.

btw Doyll i got 2 of them with the case mods i did and i am getting way better performance than what i had with the NB's and before the case modding (drilling out grills adding 1 filtered intake etc.)

I run them atm during gaming they are around 40% speed the system that is OC-ed now is getting temperatures that i was getting with the NB at 60%+ before an OC ... and i can't even hear them biggrin.gif
Oh and the OC is also sweet biggrin.gif FX 8350 upped from 4000/4200 boost to 4320/4875 boost

Temps are cool / noise is low /

Edited Bald part.
Edited by slavovid - 7/24/16 at 11:27pm
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post #2173 of 2742
Quote:
Originally Posted by slavovid View Post

So in other words the test of the MagLev fans will not be exactly accurate at low speeds using voltage control it has to be redone with PWN control.

btw Doyll i got 2 of them with the case mods i did and i am getting way better performance than what i had with the NB's and before the case modding (drilling out grills adding 1 filtered intake etc.)

I run them atm during gaming they are around 40% speed the system that is OC-ed now is getting temperatures that i was getting with the NB at 60%+ before an OC ... and i can't even hear them biggrin.gif
Oh and the OC is also sweet biggrin.gif FX 8350 upped from 4000/4200 boost to 4320/4875 boost

Temps are cool / noise is low /
I think Cyclops testing is accurate. The fans move the same airflow at same rpm on PWM control as on variable voltage. The only possible difference might be bearing noise if maglev is not working properly. This would be more likely to happen in horizontal use then vertical..

Glad your mods and fan changes work well.
post #2174 of 2742
Quote:
Originally Posted by doyll View Post

I think Cyclops testing is accurate. The fans move the same airflow at same rpm on PWM control as on variable voltage. The only possible difference might be bearing noise if maglev is not working properly. This would be more likely to happen in horizontal use then vertical..

Glad your mods and fan changes work well.

My bad i thought it was clear that i mean noise in low speeds will edit my above post for people to not get confused frown.gif
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post #2175 of 2742
Quote:
Originally Posted by slavovid View Post

My bad i thought it was clear that i mean noise in low speeds will edit my above post for people to not get confused frown.gif
While it is possible the noise level at low speed may be slightly inaccurate with voltage control, I don't think it would be more than +/-1dBA .. which is less than our ears can hear.

Combine this with the fact the sound threshold / floor / lowest sound level most of us live in is 25-30dBA means any fan making less than 25-30dBA is as quiet or quieter than the sound level around it .. so we can't hear it anyway. Sure, there are a few exceptionally quiet places and people with extremely sensitive hearing, but not many..
post #2176 of 2742
Thread Starter 
Quote:
Originally Posted by doyll View Post

Sure, there are a few exceptionally quiet places and people with extremely sensitive hearing, but not many..

Do you mean a certain cat?
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Hard DriveHard DriveHard DriveOptical Drive
Samsung 960 Pro 1TB WD Red 8TB NAS 10 * 6TB HGST Desktar NAS (RAID Z2) Go away 
CoolingCoolingCoolingCooling
EK-FB GA Z170X Monoblock EK/MSI Waterblock/Backplate 2 * Dazmode Darkside LP360 MCP355 DDC @ 7V 
CoolingOSMonitorKeyboard
9 * Corsair SP120 Quiet Edition @ 7V 8.1 Pro 12-bit ASUS ROG Swift PG279Q + LG 34UM58-P Corsair Vengeance K60 
PowerCaseMouseMouse Pad
SeaSonic SS-520FL2 - Fanless Fractal Design Define S Logitech G502 Proteus Core XTRAC PADS Ripper XXL 
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CPUMotherboardGraphicsRAM
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Hard DriveHard DriveOptical DriveCooling
Samsung 840 Pro 256GB Seagate Barracuda 8TB I will end you Dazmode Darkside Maple Leaf Special Edition 
CoolingCoolingCoolingCooling
EK GTX 1070 Seahawk Feser TFC Admiral 240 Black Ice GTX Xtreme M92 6 * Silverstone SST-FN121-P 
CoolingOSMonitorMonitor
2 * Noctua NF-B9 Redux 8 Pro 64-bit Samsung U28D590D 28" 4K Overlord Tempest X270OC 27" 1440P @ 72 Hz 
KeyboardPowerCaseMouse
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post #2177 of 2742
Quote:
Originally Posted by Cyclops View Post

Do you mean a certain cat?
Him too. biggrin.gif
Where is that cat? Is he using up one of his nine lives or something?
post #2178 of 2742
A side question what happens with the sound of a case with 5 fans of XXdb and the sound of the same case with 5 fans with XX+1db

I am thinking that the difference between the two won't be 1 db correct?
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post #2179 of 2742
Im hoping to get the new corsair ml fans for my new build, but not sure yet as just forked out for ek vardars, anybody tell me if they are worth it.
post #2180 of 2742
Quote:
Originally Posted by doyll View Post

Him too. biggrin.gif
Where is that cat? Is he using up one of his nine lives or something?

The cat has been quietly working to keep the pride restocked with tuna and quiet coolers.

While the noise floor numbers being brandished about here are indeed low, I fear there's a dB fetish developing. The decibel scale was created to semi-accurately correspond with our feline human auditory perception and acoustic sound power using logarithmic scaling. It's a useful single figure of merit, usually steady state, measuring system. And easily manipulated for 'promotional' purposes.

What no external measurement system has modeled yet is perception. Studies from the previous century revealed that the 'ear/brain analyzer' can hear deep into the noise floor. And is very sensitive to low Q resonances. Resonances that hardly make a .3dB blip on a FR chart.

So...even quiet systems by 'objective' standards can generate artifacts that can be perceived. And in my case, as annoying. biggrin.gif
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