DS411+II (and others) CPU Fan noise - revisited

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le_squirrel
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Re: DS411+II (and others) CPU Fan noise - revisited

Postby le_squirrel » Thu Jun 15, 2017 6:35 pm

As I plan to keep my DS411+ another 4 years, I'd love to be able to use any fan I want, for an efficient and quiet cooling.

@mjanssen7850, could you please share your DIY work to achieve Tach -> Lock Rotor signal conversion ?

In the meantime, I've just ordered the following fans :

CPU fan : NMB 1608KL-04W-B29-L00
Lock Rotor signal, with almost the same specs as the stock CPU fan : 6CFM / 22,5db / 0,72W / 5500RPM (vs 5.22 CFM / < 21db / 0,84 W / 5000 RPM)
Only drawback = 20mm width (vs 10mm), but I think it will pass

Case fans : NMB 3110SB-04W-B49-E00
Lock Rotor signal, with similar specs as stock case fans : 36CFM / 26db / 1,08W / 2700RPM (vs 29 CFM / 30db / 0.8 W / 2500 RPM)
Only drawback = 25mm width (vs 20mm), I'll have to remove the metal protection grid and maybe dremel the HDDs drawers' plastic handles

Hope everything will run fine, I'll keep you posted.

Thanks to everyone for all the infos and the sharing !
DS411+ 4x 4To
Giga Switch: Netgear GS605
UPS: EATON/MGE Ellipse Max 600 USBS FR
Comp: i7-7700K Win10 pro
le_squirrel
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Posts: 9
Joined: Tue Dec 29, 2009 2:43 am

Re: DS411+II (and others) CPU Fan noise - revisited

Postby le_squirrel » Mon Jul 03, 2017 3:46 pm

le_squirrel wrote:(...)
In the meantime, I've just ordered the following fans :

CPU fan : NMB 1608KL-04W-B29-L00
Lock Rotor signal, with almost the same specs as the stock CPU fan : 6CFM / 22,5db / 0,72W / 5500RPM (vs 5.22 CFM / < 21db / 0,84 W / 5000 RPM)
Only drawback = 20mm width (vs 10mm), but I think it will pass
(...)


This fan has been running for a week now in my Syno, with almost no hiccup.

Strangely I had one failure alert after first power on (maybe failure from a case fan ? I haven't replaced them for now), but everything seems OK since.

I used "scotchlock" connectors to wire the new fan (I cut the wires of the old fan, to keep the 3 pin connector), without having to solder :
https://www.amazon.fr/Lot-50-connecteur ... 5WETAG0JWP
I also had to find longer screws to attach the thicker fan to the CPU radiator.

- The HDD temps are OK, and no problem to report, despite its double height compared to the stock CPU fan.
(Don't know how to monitor the CPU temp...)
- The noise level is similar to when my Synology was brand new.
DS411+ 4x 4To
Giga Switch: Netgear GS605
UPS: EATON/MGE Ellipse Max 600 USBS FR
Comp: i7-7700K Win10 pro

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