Syba 1 Port 10 Gigabit Ethernet Network Card - PCIe x4 10Gb 10GBASE-T NIC AQTION AQC107-10Gbps Ethernet PCI-Express x4 Adapter, SD-PEX24055

Low price, works, and is Multi-Gig so 1Gb, 2.5Gb, 5Gb, 10Gb all supported. Oh got 2 of these at £54.00 so bit of a bargain.

Only reason I'm knocking off a star at all is the product doesn't explicitly match the advertised photo this time. I've bought two of these previously, and received the version in the photo: half height, quarter length, black PCB. What I received this time was half height, half length, red PCB. So, if you're carefully planning your build's interior aesthetic, you may get a svelte, miniature black card, or you may get a larger, flashy red card. I'm sure I'll find a happy use for it, as I'm really just buying a few extras because the price is good. That said, these Marvell Acquantia AQC107 chips perform just fine, they give me up to 1.09GB/s transfer speeds from my NAS, consistently. Just replace the thermal pad on it prior to deploying, as the stock pad is kind of trash quality and will let the chipset overheat, causing throttling.

it’s probably one of the few cards that will fit in my current case without interfering with the cooler. It runs hot but luckily, for my setup it’s directly in the path of an intake fan.

Bought two cards for a computer to computer network (between an ESXi host and Mac OS Hackintosh). Hackintosh card started acting up within months, reporting an unplugged cable or an unresponsive device on the other end, dropping packets, and disconnecting SMB/NFS shares. Nothing was changed in the configuration and all problems and troubleshooting point to the faulty card. Found similar experiences with this card on forums online, too. Wouldn't recommend.

This Product overheated and failed. Returned to Amazon for refund.