10GTEK 1.25G SFP-T, 1000BASE-T Copper SFP, SFP to RJ45 SFP Module Transceiver for Cisco SFP-GE-T, Meraki, Fortinet, Ubiquiti UniFi UF-RJ45-1G, D-Link, Supermicro, Netgear, TP-Link and More

I originally purchased the following:10Gb SFP+ RJ45 Transceiver, 10GBase-T SFP+ Copper Ethernet Module, Supports 10G/5G/2.5G/1G Speeds, Compatible with Cisco, Ubiquiti, UniFi, Meraki, MikroTik, Supermicro, up to 30mThe above product never worked.I returned the above product and purchased this product which worked immediately.So, remember that just because a product states it will work with a particular family of products (e.g., all Ubiquiti routers), you will only know for sure after trying.Even though this product is more expensive than my original purchase, I wish I had some way to have known that this is the right product for my needs as my time is worth so much more than the few dollars I thought I would save.

Confirmed compatibility with Mellanox ConnectX3 series 10/25Gb dual port card. Used in a custom PfSense firewall gateway. Only complaint I might have is that it's reporting a 10Gb link, even though it's connected to a 2Gb port on a cable modem. This is minor though, it is connected, and I'm getting close to 900Mb throughput from my broadband, compared to the 420Mb i used to max out. (this is mostly due to properly configuring stream limiters in pfSense I think, not necessarily this gbic)One aside when dealing with these rebranded MC cards, firmware on this card had already been reverted to OEM from the Dell it started with, and downgraded a couple versions back for it to properly accept a 1GB module of another brand. So i can't say whether this module would have required this to happen as well, but if you have difficulty with it in a Dell/HP version of a Mellanox card, this is likely what you'll also have to do--those versions of the firmware had locked out the use of non-optical/3rd party modules. They really wanted you to only use their Dell fiber modules only.

This SFP is providing a nice high-speed connection between my UDM and its POE switch. It's been in place now for a few weeks, and I haven't had any link failure issues, so I'm going to say it's good.

Works great, full 10GbE throughput as expected

Update: 10GTek reached out to me and offered a refund if I returned the adapter. The thing that I most appreciate, however, is they asked for a lot of information about my system and how it failed. They want to test the returned unit to see why it was acting this way. I can't ask more of a company than to stand behind their products and try to better them as they find issues. I would be very comfortable buying more products from them knowing now that they will stand behind their products past the 30 day return window.This worked great for about 45 days as the WAN adapter on my Ubiquiti UDM, then all of a sudden I started having all kinds of speed problems, latency, and dropped packets. It correctly negotiated the port speed on the ethernet side (5Gb) and never ran hot. I thought it was an ISP issue but when I removed this adapter and went straight into the 1Gb ethernet WAN all of my problems went away. This is absolute junk and now the return window is closed.

Installed into our Synology UDM unit; works perfectly, picked up the SFP port immediately and started working at gigabit speeds. For the price, this is an awesome deal.

Trabaja excelentemente bien

Device couldn't auto negotiate to 1.25 Gbps link speed.When I tried to force the link to that speed, it wouldn't work at all.No matter what I tried, the device just stayed stuck at 10 Gbps and wouldn't auto-negotiate to proper speeds when paired to any interface at varying link speeds.This caused issues when trying to communicate with my ISP via a WAN link.There is quite a bit of overhead as well, expect to lose about 200+ Mbps on your link, even when it does work.Runs hot.Quality is average.I feel like the compatibility isn't great.It was easy to setup.It has a single port capacity.All in all, I feel like this wasn't worth the price I paid.