X520-DA1 10GbE SFP+ Fiber Ports Ethernet Adapter for Servers, NAS and Desktop PCs, PCIE X4 to 10GbE SFP+ Fiber NIC Card for Gaming, Intel 82599EN 10Gb/s Converged Ethernet Controller (X520-DA1)

Excellent controller. Worked out of box without installing any drivers and was detected perfectly by the bios on my Supermicro motherboard with full functionality.

This board, brings 20g to my computer and I must say, my computer has never behaved so smoothly with this installed. No more bottlenecking usb connections. Ndi forever!

Inexpensive 10gb network card. Full 10gb in x4 slot. The heatsink is bigger than most other cards, I have mine in the bottom slot on my matx motherboard in an Asus AP201 and have Lian-Li P28 fans on the bottom, these fans are 3mm thicker than standard fans, the heatsink presses into the fan a bit and made installation difficult. I tried a different brand 10gb nic that had a smaller heatsink and that one fit without issue but that card wouldn't link at PCIE x4 so it didn't get 10gb. I'll probably sand down the heatsink a bit so it's not pressing into the fan.

This is an older chip as others have mentioned, but it's still plenty capable of the advertised 10gbps speed. The price is on point, being among the cheapest options for 10gbps networking. There's no issues with build quality or compatibility that I've run into. The one thing to note with compatibility is that Windows does not include drivers for this device. You need to install them from the disk or from online before the NIC can be used. I've taken to adding the driver to the USB thumb drive I use to reinstall Windows. Otherwise, there's no bloat. Installing the drivers is painless, and quick. After that it works like any other network card.

This is a clone of the old Intel X520-DA1. Drivers were included on a mini-CD and worked fine in Windows 10 with a twinax cable. I did not test it with a fiber or RJ45 adapter. Clones do not work in all products so do your homework. 5 stars for the price and Windows compatibility.

Works with Windows 11 and is a great value. Must download drivers separately from the internet before to get Win 11 to work easily. There is a large thread about this on reddit. Item was easy to install and both normal and half height covers were included.

NIC works as advertised. Nice to have 10GBe on an older Dell

Unfortunately, it did not work with QNAP NAS. Though, this card always comes out when searching for QNAP compatible network card on Amazon.