Vogzone 25GbE NIC Card for Mellanox MCX4121A-ACAT, PCIe 3.0 x8 25Gb Ethernet NIC with Mellanox ConnectX-4 Lx Chipset, Dual SFP28 Network Card Support RDMA

It’s a 25G dual Mellanox dual Ethernet/rdma card for $100. Seems to work just like the name brand ones. I’ve run it at 25G with direct sfp cable, and 1G with sfp to rj45. I think it does not do 2.5G/5G

Used two of these to connect between my NAS and desktop PC. Both machines are running on Windows and neither had an issue working as soon as the network card was installed. My devices are relatively close so I am currently using DAC cables. In testing a file share in between my NVMe drive on the NAS and local PC I was able to get a transfer speed of 2.24GB/s, around 2,240 MB/s or ~19Gbps without any network adjustment or tuning whatsoever. The NVMe drives should be a bit faster than that but this was good enough for me, until I get more remote NVMe storage only a fraction of my data is available at these speeds anyways. HardwareIDs below as reported from device manager PCI\VEN_15B3&DEV_1015&SUBSYS_006915B3&REV_00 PCI\VEN_15B3&DEV_1015&SUBSYS_006915B3 PCI\VEN_15B3&DEV_1015&CC_020000 PCI\VEN_15B3&DEV_1015&CC_0200

I've bought around sixteen of these and they've all been solid. I don't have any brands/models to compare them to. So, I don't know if they could be any better. Nevertheless, I'm getting pretty close to full 25GiB in speed tests. I'm using these with Mikrotik switches and 10Gtek transceivers.

No problems

Installed and worked perfect.

My first purchase was made on Aug 2024, it was a decent product with a nondescript package. The confusion comes when I was updating the firmware. The site claims the model to be MCX4121A-ACAT but I found it was detected as MCX4121A-ACUT, U for UEFI. This card has worked fine although I could not figure out how iscsi wouldn't work in BIOS. It works fine in windows but that is a different story. The speed in iperf3 comes at around 19.2-23.4 Gbps. I purchased the second time just recently in Mar 2025 and found that packaging and construction have become all different. Now it is clearly labelled as an ACAT model while still claiming UEFI functionality which caused further confusion. I ended up returning the second item without testing and switched to something different.

One of the few 10GB variations that works natively in Proxmox. I bought 3 of these.

Installed easily and performs exactly as expected. Speeds are fast and stable, no drops under load. Dual ports make it flexible for different setups. For the price, it’s good value if you need a serious network upgrade.