SG-3100 - how to reduce it's temp [quietly] ;-)

pmk_mck

@serbus - agreed, a USB powered fan is such a sweet spot of a solution, no ext psu required, no additional trailing leads, and with a couple of power/speed settings the fan you shared looks like a great fit. Plus with heat naturally rising, drawing it off from the top could actually produce better results. I might try that, thanks ;-)

beachbum2021

i use three wired usb fans connected to the bottom of a laptop prop and blow air into the bottom of the device. my temp went from 62-65 to 56-58

akuma1x

This "double" USB fan kit should do the trick, one below, one above:

https://www.amazon.com/AC-Infinity-MULTIFAN-Receiver-Playstation/dp/B00JLV4BWC

Jeff

pmk_mck

@akuma1x - thanks for taking the time to post. The whole cooling to noise ratio situation has changed a little bit because my ISP has changed. Moving away from Virgin Media’s DOCSIS 3.0 350Mbps service to BT’s 910Mbps FTTH meant that I was able to put the SG-3100 into my 27u cabinet, but most importantly out from behind the TV and out from the living room. In the cab with the fan running the SG-3100 ticks over at a respectable 50°C, which is fine for me.
Way back I did try the Hi/Med/Low/Off USB fans but they were just too loud for the living room. But I loved the fact that they didn’t need an external power supply like my current setup does.

stephenw10

@pmk_mck said in SG-3100 - how to reduce it's temp [quietly] ;-):

to BT’s 910Mbps FTTH

Grr. g.fast only just reached me.

beachbum2021

probably a fire hazard

pmk_mck

@beachbum2021 - so what temp does the Netgate run at during a hot day or worst case for you please?

pmk_mck

@stephenw10 - if you’re close to the street cabinet then the speeds should be pretty respectable. What does your CPE train to in upstream and downstream please? And do you have to supply reverse power to the DSLAM in the cabinet?

beachbum2021

@pmk_mck it runs about 53 on a lite load day, 61 tops on a hot day.

stephenw10

@pmk_mck
I am awkwardly positioned relatively close to the exchange but quite far from the g.fast 'POD' cabinet. I actually have two DSL lines here and the regular FTTC is pretty good though contention is quite high these days. I used to get close to the theoretical maximum in that line. The sync speed varies but today I'm seeing:

Max:	Upstream rate = 26378 Kbps, Downstream rate = 75080 Kbps
Bearer:	0, Upstream rate = 19999 Kbps, Downstream rate = 66999 Kbps

The other line with g.fast enabled is faster, ~140Mbps, but that's towards the low end for g.fast as I understand it.
I have no idea what's syncing at since the modem is locked up tight.

Kinda straying off topic there.....

Steve

pmk_mck

So yesterday I placed the SG-3100 upside down, so that the vents were facing upwards, and the white lid down. Same fan as before sucking the air away from the vents on the SG-3100. And left it for a day to settle down.

Results: There's no difference in the temps reported by the SG-3100 when upside down with the same fan in the same place, sucking air away from the unit. It's still around 49C any time I look at it. And then when I run a speedtest over ethernet (~650Mbps) the temp peaks at 57C and appears to normalise around 54C.

beachbum2021

@pmk_mck yours is still running less hot than mine. I moved the 3 fans. one blows air in the bottom vents and two on each side suck the air out. The issue I believe is that while we're blowing air in, the chip sets are on the opposite side of the case. Mine has never gotten to the low levels yours are.

pmk_mck

When my SG-3100 gets busy, it warms up for sure too, at 41% CPU the temp is 55C.

Maybe my next step is to 3D print or CNC a new top cover/lid for the SG-3100 and make it with a load of holes in....or a fan cage?

Or, actually I could probably take the top lid entirely off the SG-3100, and leave the fan sucking air as-is today?

pmk_mck

@serbus - So yesterday I placed the SG-3100 upside down, so that the vents were facing upwards, and the white lid down, with 3mm tall rubber feet to create an ambient. Same fan as before sucking the air away from the vents on the SG-3100. And left it for a day to settle down.

Results: There's no difference in the temps reported by the SG-3100 when upside down with the same fan in the same place, sucking air away from the unit. It's still around 49C any time I look at it. And then when I run a speedtest over ethernet (~650Mbps) the temp peaks at 57C and appears to normalise around 54C.

beachbum2021

@pmk_mck take the case off and let it run with a fan blowing on it, i mean..if you're blowing air in the dust is there anyways. Just dont want to electrocute or short anything during the test. I can do the same if you want to know the result.