2.5G Dual RJ45 Port PCI-E Network Card with RTL8125B Conrtoller, QFly 2.5Gb Ethernet Adapter Card Compatible with 100/1000Mbps/2.5G, Support Windows/Linux

I picked up two of these QFly 2.5G dual-port PCIe cards and they’ve been phenomenal for the price. Easy install, solid performance on both Windows and Linux. The only hiccup was with PCI passthrough — the Realtek RTL8125B chipset doesn’t play nice with virtual machine passthrough. I had to fall back to a VirtIO setup for my router VM. Not ideal, but it works — and that’s on the chipset, not the card. Pros: Reliable 2.5G speeds Plug-and-play on most systems Great price Dual ports on a PCIe x1 slot — perfect for compact or low-slot systems Cons: Realtek chip has known passthrough issues in VM setups Verdict: 5 stars. Great card, just avoid it for passthrough-heavy virtualization.

I wasn’t sure about this card but it showed up and the driver loads Traffic flows and it works well without any dropped packets What more can you ask for

Card itself works fine but ran into the same issue with the low profile mounting bracket that another reviewer experienced. It seems the dimensions of the low profile bracket are off to where you can't mount the card properly with it installed (card sits an angle in the PCIe slot). Can't speak on the regular bracket since I haven't used it. This card would've been perfect had it not been for the low profile bracket issue. If seller/manufacturer can get me a replacement low profile bracket that fits properly like they did for the other reviewer, I will provide an update. UPDATE (7/12/23): After leaving my initial review, the seller reached out and offered to send me a replacement low profile bracket. Got the bracket in the mail today and it fits perfect! Thank you!

Works great it does have a blue led that blips along, not great for glass or open cases that you’ll keep in your room. Works smooth on Linux btw. **Update** Its dead Jim, not even a year old FML. didnt even get that much use as it was hooked to my backup link.

I purchased this card for an existing Ubuntu 20.04 LTS Xen server. It works great, and fits very nicely into a 1U server chassis. But, the big problem is drivers. The manufacturer download site is laughable. The only option is to download a source version of the driver, once you find it, and then rebuild the driver and your kernel to include it. It would be one thing if this was for a really old or really new OS, but Ubuntu 20? Fortunately, I found a project on GitHub (awesometic/realtek-r8125-dkms) which builds and packages the driver. All you need to do is to install DKMS, and then install the downloaded .deb file, and all is well. In summary, this is a great little card, marred by terrible driver support. Apparently Ubuntu 22.04 LTS may include RTK8125 support built-in, but for older OSs, forget it.