Review on 🔌 Wiitek 10GBase-T SFP+ to RJ45 Copper Modules: Compatible Transceiver for Cisco SFP-10G-T-S, Ubiquiti, D-Link, Supermicro, Netgear, Mikrotik, Unifi (Cat 6a/7, 30-Meter) by Krystal Simmons

Was able to extract full speed from Intel I225-V v3 NIC. Used in a Netgear XS708T switch with 2 SFP+ ports. Throughput tests with iPerf3 show that the speed is asymmetrical. The speed from the Intel card is a full 2.5 Gbit/s and the speed to the Intel card is less than 500 Mbit/s. Technical support has attempted to change almost all buffer sizes and offload settings in the Intel NIC driver, including using jumbo frames. Nothing worked and I ended up having to send it back. You may have better luck with Realtek 2.5Gb/s NICs and this transceiver, but if you use it with Intel 2.5Gb/s NICs, don't worry.