10Gb Network Card Intel X550-T2 NIC Ethernet Card, PCIe v3.0 x4, Dual RJ45 Port, with Intel X550-AT2 Controller, 100M/1G/10G Ethernet LAN Adapter Support Windows Server/Windows/Linux/Vmware

Installed in a vintage 2016 system (!), it still worked perfectly, was recognized by OPNsense (FreeBSD) which is often picky about NIC's, and operates at full speed. No issues at all.

I tried connecting the link between second floor and basement Netgear XS524EM switch. The 10gbps link was established well for first 5 minutes but then, the link disconnected every once in few minutes. I am returning this and going to buy a genuine intel product to see if that works better. Update: the genuine intel was less severe but still disconnecting every once in a while. I finally purchased a non-intel network card that is not disconnecting. I am increasing the number of stars to three since the customer service was very good.

Great card, works well and performance is wonderful

To be fair I was a really disappointed when this card turned up. Considering how much it cost the heat sink was quite loose and wobbled about. I tried to straighten it up but it kept reverting back to its wonky state. There's a couple of plastic pegs on opposite corners of the heatsink, held in place with springs, but it looks like one of the springs was weaker than the other one and compressed fully causing the issue. Perhaps my card was faulty but this sort of thing should be picked up in QA. The card seemed to work and was detected fine after installing the Intel drivers from their website. This also leveraged the extra functionality provided by this card's chipset such as VLANs, Link Aggregation etc. so it clearly works and appears to be a genuine Intel chip. However, the heatsink got incredibly hot after only a few minutes use. I just didn't have much confidence in the heatsink doing a good job of dissipating heat, or in the plastic pins holding it on top of a chip that clearly gets really hot. If you are looking for a Dual port 10GbE RJ45 card I think there are better quality options out there. Pros: - Appears to be a genuine Intel chip - Works with Intel drivers to leverage advanced functionality such as VLANs, Link Aggregation etc. - Comes with low profile bracket Cons: - Expensive - Really poor build quality on the heatsink and installation - Runs very hot

R8127を試したもののUbuntuにドライバを入れた辺りから不調になってしまい、泣く泣くこちらに交換しました。 とりあえず挿しただけで、サーバ間で9.6Gbpsで転送できています。 安定性などはこれからですが、ドライバでどうこうしなくて良いというのは精神衛生上素晴らしいです。 純正ボードということですが、10Gtek製のようです。 --- 現状、特に支障なく（サーバが落ちることなく）運用できています。 100GB程度のやり取りでは問題ありません。大量データの移動はまだ試していませんが、さすがの安定性かと思います。

舐めてんのか。だったら10GTek使うわ。