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Forum Discussion
12v fan on 5v supply?
Just received my pair of Noctua NF-A4x20 FLX fans I intended on replacing the stock ones to reduce the noise of the refurbished switch I've just bought, which I waited until I received it to check th...
Hey did you ever get anywhere with this? I have the same switch and did the same thing - opened it up, saw the 12v fans and ordered the 12v noctuas which spin up for a second or 2 then stop.
Checked the voltage and it's putting out around 6v.
Opened up a GSM7248 and it had one of the exact same stock fans but that switch was putting out 12v from the pins. If I try that one in the M4100 it runs no problem.
If I try the noctuas in the GSM7248 they run and stay running and no fan fault light.
Should I just try the 5v versions of the noctuas instead?
Checked the voltage and it's putting out around 6v.
Opened up a GSM7248 and it had one of the exact same stock fans but that switch was putting out 12v from the pins. If I try that one in the M4100 it runs no problem.
If I try the noctuas in the GSM7248 they run and stay running and no fan fault light.
Should I just try the 5v versions of the noctuas instead?
Hi,
wouldn't recommend the 5v Noctua either. I think where your getting the 6v is that the switch is just sending a lower voltage to have the fans run at a minimumal speed.
I even went to the expense of getting another set of 12v fans, think they were noiseblockers, and they didn't work! I got so frustrated, not only having to disconnect, take the switch out of the rack, take apart, that I sensed the wiring colours differentiate from all the others from the stock fan that Netgear phase reverse somewhere, anyway, cut a long story short after many variations I think I blew the 12v power rail.
so bought another switch off eBay, probably easier and cheaper than sending this for repair. Noticed an American eBay seller selling fans for the Netgear switch. He wasn't very forthcoming as to what voltages were where and what fans he's using and his prices are expensive and cost of shipping and import fees, I headed over to Aliexpress and have bought a selection of 3 or 4 fans that maybe suitable and should cost the same if not less than our US eBay guy. When they come in from China, I'll let you know, may have spare fans available!
- Let me know how you get on. The noctuas spun up in the GSM7248 when the positive and negative were reversed. I've ordered some 5v noctuas to try the same thing with reversing the pins.
Have seen the US seller on ebay as well but the cost plus shipping seems extortionate and no mention of what the noise output may be with those fans fitted.
I have so much Netgear kit I'd prefer not to have swap out equipment for other manufacturers and spend even more money, but the way they use fans in each device seems pretty strange.
I've made the same mods with other dell, hp and cisco switches and not had any problems like this.
Would be very interested to hear what results you get with the new fans.Ordered the fans after i bought the latest switch on eBay, fans were shipped on 9th Jan via Aliexpress shipping, so in theory should be here at the end of the month. I'm now living in Dublin, so opted for the eBay "International shipping", even though its shipping from the U.K., I reckon the parts from China will be here before that gets here.
The Netgear switch replaces a Ubiquiti PoE switch which went bad not even after two years, never going to buy Ubiquiti again (had a Unifi G3 filter stick as well!).
id be interested in what you consider the pin (voltage) configuration, am so confused with Netgear and Noctua differing configurations?
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