CRS309 (8 x SFP+, 1 x GbE RJ45)
CSS610 (2 x SFP+, 8 x GbE RJ45)
Connected via a single SFP+ ↔ SFP+ connection. One could use a SFP+ DAC instead.
If more fanless RJ45 ports are wanted, the CSS610 can be replaced with either the CSS326-2S+ or either CRS326-2S+ variant.
If fewer SFP+ ports are wanted, one could just use the CSS610, CSS326-2S+, or CRS326-2S+. Each comes with 2 SFP+ ports, after all. One could also downgrade the CRS309 to a CRS305 (4 x SFP+, 1 x GbE RJ45)..
All of the suggested switches here are completely fanless. There are other Mikrotik fanless switches with SFP+, but I only suggested the ones that I feel are most relevant.
RouterOS Switches:
CRS309 (8 x SFP+, 1 x GbE RJ45)
CRS305 (4 x SFP+, 1 x GbE RJ45)
CRS326-24G-2S+ (2 x SFP+, 24 x GbE RJ45), -RM and -IN are the rackmount and desktop versions, respectively
SwitchOS Switch:
CSS326-24G-2S+ (2 x SFP+, 24 x GbE RJ45)
SwitchOS Lite Switch:
CSS610 (2 x SFP+, 8 x GbE RJ45)
It seems that all 10Gbps RJ45 SFPs consume relatively a lot of energy and thus run pretty hot. And they still have to remain under certain temperature threshold. For optical SFPs maximum environmental temperature is around 70°C, industrial temperature rating increases that to 80°C. And by environnent temperature it’s the SFP casing because that’s the environment to which SFP dissipates energy. So it’s only the right thing that switch/router tries to keep SFP case temperature below 70°C. In case of fanless designs, cooling of SFP+ RJ modules can be inadequate and can overheat and consequently malfunction.
We can agree that it would probably be possible to improve cooling of SFP cases with some advanced temperature engineering … but MT did what they did and we’ll have to live with that.
That said it seems that it’s only possible to have truly silent 10Gbps switch if ports are RJ45 and not SFP … because MII chips can be directly coupled with massive heat sinks … the closest Mikrotik offering is CRS312-4C+8XG-RM with 8x to 12x 10Gbps RJ45 (4 ports are combo RJ45 / SFP+). Doesn’t seem to be fanless design though. If you need silent operations, then generally your only alternative is to settle for 1Gbps connections.
In our datacenters we run dac cables to save energy instead of rj45 plugs that consumes a lot of power. Passive dacs use less than 0.15 watts. Singlemode short range uses around 1 watt and rj45 10gbe uses up 5 watts.
First of all, many thanks for your help (I could not make it alone).
I can report that the MikroTik CRS309-1G-8S+in is now operating fanless.
I guess “+in” in product name means home use but it is also rackable.
I returned all other hardware (and saved quit a bunch of money).
i will also sell my Mikrotik crs312-4c-8xg-rm on the second hand market.
The only issue is that the 10Gb copper SFP+ modules are getting hot, around 92°C.
The DAC cable runs very cool but does not report any temperature.
The fiber SFP+ are around 40°C.
The switch CPU is only 30°C in operation.
To describe my needs, I live in a building made of concrete and WIFI is very bad.
So I connect with copper wires and this makes a lot of wires which I will replace with fiber.
Copper wires are too thick and only fiber can coexist with electric wires.
On the long run, I plan to remove all copper.
I purchased the two fanless switches and sold the other.
My home room is now completely silent.
I use two passive DAC to link them with LACP.
The only issue is that sometimes the 10Gb copper connector goes beyond 92° and gets disconnected.
So I am planning to replace it with fiber or DAC only.