10Gb Dual LAN SFP PCI-e Network Card, Intel 82599(X520-DA2) Controller, NICGIGA 10Gbps Ethernet Adapter, 2 * 10Gbe SFP Port, 10G NIC Card, Support Windows/Windows Server/Linux/VMware

Out of the box this was not running at the 2.5Gb speeds (even though Windows reported it as running 2.5Gb) it was staying around 900mb with iperf3 test between 2 other machines on network that both have 2.5Gb NICs. Using the QNAP 2.5Gbe unmanaged switch for 3 PCs that all have 2.5Gbe NICs. They are segmented on their own VLAN coming from pfsense firewall appliance which also has 2.5Gbe. After updating the drivers from the Realtek site as per the pamphlet that came in the box along with a small form factor screw driver and 2 screws (using case screw to match black aesthetic) and the 2 I/O plates, then it unlocked the full menu in the interface's controller properties. Also was getting closer to the 2.5Gb speeds on local network, RDP feels smoother and stable connections without drops. There is some irregularity in the iperf3 tests though. Not getting the irregularities from 3rd PC to main PC so not sure if it's driver related or just an issue with the Realtek chipset of this card. Overall though satisfied with the price to performance and hope there will be future driver updates, not counting on it though. For what I need it to do, be a stable RDP connection it seems to be holding strong and helps not feel laggy like it did with the default 1Gb port on the X370 Taichi Mobo. This is an improvement. If you do want a blacked out PCB and the bright green LED isn't visible while doing work then this is a good 2.5Gbe card. Also make sure you get the latest driver from Realtek, out of the box is not fully unlocked. Happy packets :)

I needed a second network card for my pc and this does the job. It’s pretty fast, didn’t need any extra drivers (I run windows 11) and works well. I use it to directly connect my NAS. No issues at all.

Works very well with TrueNAS. Easy plug and play installation.

Works great for my opnsense/pfsense router

Good product but it seems to struggle to fit into the case Io panel

Excellent network adapter for Windows and Linux.

I bought this 10GbE Base-T adapter for my OPNsense firewall. It worked perfectly at first and was immediately recognized by the system. Performance was great for the first few months. After four months, my firewall suddenly stopped processing traffic. The card is still detected correctly by OPNsense, but there are no link lights, and it will not recognize any connection. I am very disappointed in the quality of this card. It worked well at first, but it failed far too quickly. Consider this a warning if you plan to rely on it for more than a few months.

It works at 5gig but ONLY if you install the offical realtec driver. Sticker to download driver on the bracket has a typo so never works. Nothing a quick search didn't fix. Has really good throughput when paired with a 5gb SFP in my Cisco Meraki switch. Does run hot but the heat sink helps