Mikrotik makes a whole bunch of 10G hardware. The 8 port ones are fanless and have a heatsink on the back, and the 16 port model has a fan that only gets switched on when needed. I have one sitting behind me and it's been off all day.
It's also easy to open and replace the fan with something less noisy. Just remove a few screws, it's a standard size with a normal connector on it.
There's also big external heatsink so you could rig up a big, slow, fan to help it out a bit.
If you want to be green by the way, use fiber/DAC. The 10G copper SFP+ modules are power hungry, and Mikrotik recommends not placing them next to each other. Also the extra power draw is likely to result in fan use if you have a lot of them.
I had issues with 10G copper SFP+ modules even when there was only one installed in the switch (Mikrotik CRS305-1G-4S+IN), the other modules installed being DAC/fiber. I got random disconnects I could not attribute until I checked the switch logs - the module was shutting down because it was reaching >90C when the ambient temp was 26C. I had to add a fan.
Not all transceivers are created equal; some need more power (and then dissipate the heat), some are satisfied with less. Some can do only 30m distance, others will run over 80m distance.
The Mikrotik ones (S+RJ10) are based on Marvel chip and they are the more power hungry / run over 30m only variety. On the other hand, they can negotiate 2.5G or 5G if necessary and support a proprietary protocol to tell the switch about it, so you will that in SFP+ properties.
As I have written in the sibling comment, I have good experience with BCM84891-based transceivers. CRS305 can handle two (still not next to each other, obviously).
Oh awesome, and pretty well priced! Know what the noise level is like? The QNAP is designed to be in a home office rather than a server closet, so it’s inaudible. But my mikrotiks are passively cooled, so even better.
It's also easy to open and replace the fan with something less noisy. Just remove a few screws, it's a standard size with a normal connector on it.
There's also big external heatsink so you could rig up a big, slow, fan to help it out a bit.
If you want to be green by the way, use fiber/DAC. The 10G copper SFP+ modules are power hungry, and Mikrotik recommends not placing them next to each other. Also the extra power draw is likely to result in fan use if you have a lot of them.