10GBASE-T SFP+ to RJ45 Transceiver, 10G Ethernet Copper Module, Optical SFP RJ 45 10Gb T Mini-GBIC Compatible with Cisco SFP-10G-T-S, Ubiquiti UF-RJ45-10G, Mikrotik, Supermicro, Fortinet, up to 30m

Quality 10gig SFP+ Module
These are quality SFP+ modules which work extremely well in my Uniquiti Un-Fi 10gig aggregation switch. They run a little warm under heavy use, as do all RJ45 101gig SFP+ modules. I put a small heatsink on them to help keep them cool. I’ve never had a problem with them throttling or failing. I have a number of these.

Reliable 10GbE Copper Transceiver, Runs Warm
This SFP+ to RJ45 module worked flawlessly with my network setup, providing stable and consistent 10GbE connectivity. The build quality is solid, and installation was plug-and-play with no compatibility issues across my switch. Latency is low, and I haven’t noticed any drops in throughput even during heavy file transfers. Like most copper-based SFP+ transceivers, it does run warm, but that’s expected for 10Gb over copper. Adding some airflow in the switch enclosure helps mitigate the heat buildup. If you need a cost-effective way to upgrade to 10Gb networking, this is a solid and reliable option.

Works great with 2.5Gbe. However, must have egress rate limiting ability on SFP+ port.
TL;DR: If your switch port supports egress limits of 2.5Gbps or 5Gbps. You should have good luck with your 2.5/5g ethernet ports. Otherwise, measure with iperf and pay attention to iperf traffic direction before you celebrate.I have a Gigabyte Aorus AM4 ITX board with a RealTek 2.5G port. When connected to my Ubiquiti XG-16switch however, the ethernet ports negotiate at 1Gbps only. This transceiver popped up in my search as something that will enable the full 2.5Gbe.Plugged it in and everything seemed to work great. Switch sees it as a 10Gbe SFP link while windows sees it as a 2.5Gbe link. Large file transfers looked good too. Between 80-130MB/s. Not great but ok.Running iperf3 however, revealed a big issue with my setup. My NAS (ReadyNas 626X with 10Gbe ethernet) on the same switch ran iperf3 in server mode (iperf3 -s) while the PC ran it in client mode (iperf3 -c): this reported a solid 2.37Gbit/s. Great right! However, large file transfer in use felt worse that with my 1Gbe link. The NAS has a xeon processor and can easily handle the needed 10Gbit speeds for iperf3 (I have a 5950x on the PC which is a beast): tested with a different 10Gbe machine on my network.Investigating further it turns out that I misunderstood. iperf server does not actually serve!! The iperf client pushes data to the server. I need to run the client (PC) with ‘-R’ flag to have the client consume data (switch pushing data into the transeiver).So traffic from PC -> Transciever -> XG16 -> NAS went though at full speed 2.37Gbit/sTraffic from NAS -> XG16 -> Transciever -> PC was a miserable 200-600Mbit/s with tons of retries.If I remove the transceiver and switch to the automatic 1Gbit downgrade (with egress limiting), iperf3 gives me 970MBit/s with 0 retries. Way better than with this transceiver.The general diagnosis at this point seems to be that the switch is pushing packets too fast for the port to handle and dropping a lot of packets slowing everything down. Solution seems to be to turn on egress rate limiting on the port. Basically, tell the switch that even though the SFP+ port negotiates at 10Gbits, limit outgoing traffic to 2.5Gbit/s. However, Ubiquiti in their wisdom do not allow egress rate limiting to more than 1Gbit/s: on a 10Gbit switch! Why!! Gah!So yeah: make sure that your switch can handle egress limits at whatever reduced speed you want to run your 10G connection at. Better still, pick up a Mellanox ConnectX-3 if you have the PCI slot for it.

Works on my UDM pro
work as advertised on my UDM Pro

Working well. Speedy delivery!

Works great! Multi-rate cable support: 10G/5G/2.5G/1G/100M/10M. The SFP+ side supports 10G/1G only. Supports auto-negotiation ONLY on the cable side! Supports pause frames on both sides.Beware that the exposed case temperature reaches 45°C to 55°C and can burn skin in a few seconds … but it still runs cooler than some competitors!Recommend only use one module for every 2 SFP+ slots because of heat produced and power demand.Using DAC/AOC/fiber cables are always a better idea than 10G over copper cables!