Netgear Switch GS748T GS724T Loud Fan Swap Modification

Introduction

A while back I picked up a Netgear GS748T 48-Port Gigabit Switch.  Price-wise the switch was hard to beat considering the included feature set and density of ports all in one handsome package.  The web interface is a bonus, but I will get to that later.  I plugged in my switch and to my astonishment heard the full furry of 3 40mm internal fans raging at full strength.  My first thought was a hopeful pause while I waited for the fans to throttle down after initial boot, but that never happened.  Granted this switch was intended for the server room environment, and noise considerations are rarely a factor in a rack-dense world of competing spinners for loudest hum.

So I wasn’t going to let this loud switch put a damper on my excitement over a litany of other quality features.  I ventured fourth and started pulling screws to see what I could do with this particular piece of hardware.  The switch shell came apart quite easily (3 screws on each side and two on the bottom face plate).  I was joyed to find three industry standard fans (1x 40x40x20mm, 2x 40x40x10mm).   After looking up the specs on the factory fans I saw that the 40×20 was moving 10 CFM @ 33 dBA while the 40×10 was moving 10 CFM @ 37 dBA.  I knew I could do better than that with the great selection of fans on the market.

Gritty Details

As a solution I ended up using the Scythe Mini-Kaze Ultra (SY124020L) times three.  These fans put out 5 CFM @ 20 dBA.  That will cut the noise output by roughly 40% while maintaining half the stock airflow.  As a word of warning consider the environment you are placing this switch into.  I would not recommend placing this switch into a very warm or hot area after modifying the fan configuration.  Nor would I swap the fans if you intend on fully utilizing the port capacity with moderate or greater traffic.  Keep in mind it was built to the original specification for a reason.  I only modified my switch because I don’t intend to push it to the outer limits of its capabilities.  This process should work for the Netgear 24-Port GS724T too, which has just one fan to deal with.

If you stray from the Scythe model I selected be sure to take into consideration the power header.  The Netgear uses a standard two-post power header block and the Scythe fans match up nicely.  Make sure you unplug the switch before starting and avoid the power supply.  This will obviously void your warranty.  You’ve been warned.  Now that I got the PC (the political kind) crap out of the way we can move on to the good stuff, like my latest video depicting the full process.

Required Tools/Items:

Fan Specification Comparison:

Factory – Delta Product Groups – 40x20mm, 9000 RPM, 10.1 CFM, 33 dBA / 40x10mm, 8000 RPM, 9.5 CFM, 38 dBA (Model: EFB0412VHD / EFB0412VHA)

Swap – Scythe Mini Kaze – 40x20mm, 3500 RPM, 4.9 CFM, 19 dBA (Model: SY124020L)

How-To Video


  • space_diver

    Hi,

    i hope you realised that the scythe fan you use is rated for 12Volt which means that using it on 5V the airflow is not half the stock fans but at the most 20% of it. it still could work but i would advice to at least use this TFD-4020LL05X (titan).
    It is built for 5V and has the wanted speed an sound qualities without compromising on cooling performance. (http://www.titan-cd.com/product/showProfandc_en.asp?ProID=259)

    • space_diver, you are partially correct in that the scythe fan I use is 12V. My switch (GS748T) used in the video is using 12V power feeds, not 5V. The stock fans I pulled from the factory switch were also rated for 12V. So everything matches up as it should, meaning there would be no speed reduction from the voltage drop if that were the case. I will emphasize that it is always a good idea to check these things for yourself. It is always possible that a one-off hardware version release of the 24/48 port model of the switch may use a 5 volt fan instead of 12.

  • Spiraldeath

    Actually I think you are both partially right.

    Looks like the 48 port model runs on 12v while the GS724Tv2 – 24 Port model runs on 5v

    • Good to know for sure. Thanks for the update.

  • Tom

    Have a NetGear GS724T Switch. It works well but the fan in it (only one) is a piece of crap. We call NetGear and are told they WILL NOT HELP, WILL NOT DIRECT US TO ANY SUPPLIER, WILL NOT GIVE SPECIFICAIONS. If the switch is out of warrantee you are out of luck. We are instead told we need to buy an new switch. This fan must cost $1.50 someplace, and NetGear wants you to buy a new switch to replace it, or go without it in a “well ventilated area”. Glad the car companies do not work along these lines or we would need a new car if a tie gets flat or wears out. Next switch will not be NetGear.

  • Fred

    I also have a NetGear GS724T Switch. The single fan is spec’d at 5V .24A and it was getting pretty noisy. I replaced it with a 5V .12A model. Issue I had was the original fan screws were “friction fit” into the small fan mounting holes (no nuts to hold it in place). The replacement fan has larger mounting holes, so the screws don’t hold it in place. I used some 3M double-sided sticky foam to hold it in place. Works so far and has a side benefit of dampening vibrations since the fan is not in direct contact with the metal case any more.

  • FYI on a NetGear GS748T v4 switch fans are on the opposite side, 40x40x20mm 3pin 12V. The strange thing is that the black and red pins are inverted: use a small screwdriver to pull them from the connector.

  • Just standing up the new comment systems using Disqus. Hopefully this encourages more discussion and better engagement. Leaving comments should be a lot easier now.

  • Hey guys! Have you had success or gotten any idea from this article on how to quite your noisy switch down? Let us know what you did, and how it worked!