---
product_id: 556305304
title: "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"
brand: "qfly"
price: "306.85 DT"
currency: TND
in_stock: true
reviews_count: 7
category: "Q Fly"
url: https://www.desertcart.tn/products/556305304-2-5g-dual-rj45-port-pci-e-network-card-rtl8125b
store_origin: TN
region: Tunisia
---

# 2.5 Gbps blazing speed Dual RJ45 ports for versatile connectivity PCIe x1/x4/x8/x16 slot compatibility 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

**Brand:** qfly
**Price:** 306.85 DT
**Availability:** ✅ In Stock

## Summary

> 🚀 Upgrade your desktop network game with dual 2.5G ports — because speed waits for no one!

## Quick Answers

- **What is this?** 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 by qfly
- **How much does it cost?** 306.85 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/556305304-2-5g-dual-rj45-port-pci-e-network-card-rtl8125b)

## Best For

- qfly enthusiasts

## Why This Product

- Trusted qfly brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Blazing 2.5G Speeds:** Experience internet and LAN transfers at 2.5x the speed of standard gigabit cards, perfect for power users craving ultra-low latency.
- • **Dual-Port Powerhouse:** Double your wired network options with two RJ45 ports, ideal for multitasking professionals or backup connectivity.
- • **Compact & Flexible Fit:** Includes both low-profile and full-height brackets, ensuring a sleek installation in any desktop or HTPC chassis.
- • **Plug & Play Versatility:** Seamless compatibility with Windows and Linux systems—no driver hassle on Windows 10 and easy setup across platforms.
- • **Future-Proof Your Network:** Supports 100Mbps, 1Gbps, and 2.5Gbps speeds, so you’re ready for today’s and tomorrow’s networking demands.

## Overview

The QFly 2.5G Dual RJ45 Port PCI-E Network Card, powered by the Realtek RTL8125B chipset, delivers ultra-fast 2.5Gbps Ethernet speeds with backward compatibility for 1Gbps and 100Mbps. Designed for professional-grade performance, it fits any PCIe slot (x1 to x16) and includes both low-profile and full-height brackets for versatile installation. Compatible with Windows and Linux, this dual-port adapter is perfect for multitasking, high-speed data transfers, and future-proofing your wired network setup.

## Description

Buy 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: Network Cards - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great Budget 2.5G Card – Works Well, With One Caveat - 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.
Review: Works fine on Windows and Linux, with caveats - Installed this into a new system running Debian 12 (bookworm) and it came up plug-n-play with no issues or fiddling, no doubt thanks to the new non-free-firmware setup. Transferred 20 TB over it with no problem, though it sat at ~80C the whole time - this could be due to not having sufficient airflow at that point, can't say for sure. In any case, I'd recommend you watch the temps on this one. Also note it was actually only running at 1GBit speeds for that, as the machine on the other end wasn't configured properly. But the network segment on the QFly end was 10Gbit. Then I moved the card to a Windows 10 machine and the drivers didn't come up automatically or via a Windows Update search using a different connected NIC. I had thrown out the packaging and CD at that point and couldn't find drivers online. The flash drive with the drivers comes up normally on Windows (*), and you just point Device Manager's driver search at that. Haven't put it through its paces on Windows yet, but it is working. (*) Note that if you want to mount the pack-in flash drive on linux you may have issues, since (on the one I got) there is no partition table(!) - fdisk gets confused by it and claims a nonsense partition layout because it's actually a bare filesystem, so you want to "mount /dev/sdX", NOT "mount /dev/sdX1". Don't know if automount systems can handle this gracefully or not. (Also final words: the review that says that this NIC doesn't work with "linux (pfsense)" is incorrect - the card works fine on linux, but pfsense isn't linux, it's FreeBSD. Always double-check compatibility for newer hardware before you buy if you're working with BSD, compatibility is generally worse than with linux.) No ragrets.

## Features

- 【High up to 2.5x-speed】 Realtek 8125B chip combined with the latest 2.5GBase-T Technology, delivers extreme speeds of up to 2.5 Gbps, 2.5x faster than typical Gigabit network card, Ultra-low latency guaranteeing smooth data transmissions for both internet access and local data transmissions.
- 【Complete Compatibility】 Seamless backward compatibility for 2.5Gbps/1Gbps/100Mbps, Support Windows11/10/8.1/8/7 and Linux, no dirver needed on Windows10, easily download the driver in Realtek official website for other OS.
- 【Dual Port 2.5G Network Card】 By inserting a PCIe network card into the PCI Express x1 slot, you can upgrade the host with one more RJ45 port. It's a perfect choice for a Desktop PC that is fewer network ports or network port failure to connect to the wired network.
- 【Fits any PCI Express】 2.5G NIC card fits x1, x4, x8 or x16 socket; Additional 8cm Low-profile bracket provides the option for installation in small size HTPC case. NOTE: Only work with PCI-E slot, Not for PCI Slot.
- 【Low-Profile and Full-Height Brackets】PCIE Ethernet card In addition to the standard bracket, a low-profile bracket is provided for mini tower computer cases. Customized options give you the flexibility to find a bracket that perfectly fits your board design.
- 【Tips】If there are any issues with the low profile bracket that cannot be used or any other product related issues, please feel free to contact us and we are glad to serve you.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BN6CL81R |
| Best Sellers Rank | #126 in Internal Computer Networking Cards |
| Customer Reviews | 4.3 4.3 out of 5 stars (92) |
| Date First Available | November 23, 2022 |
| Item Weight | 2.77 ounces |
| Item model number | QFly-25G-DualPort |
| Manufacturer | PANSHI |
| Package Dimensions | 6.06 x 5.2 x 1.46 inches |

## Product Details

- **Brand:** QFly
- **Compatible Devices:** Desktop
- **Hardware Interface:** PCI Express x1, PCI Express x16, PCI Express x4, PCI Express x8
- **Item Weight:** 78.5 Grams
- **Style:** standard

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/612nCdf1w8L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Budget 2.5G Card – Works Well, With One Caveat
*by A***R on May 23, 2025*

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.

### ⭐⭐⭐⭐⭐ Works fine on Windows and Linux, with caveats
*by T***D on December 20, 2023*

Installed this into a new system running Debian 12 (bookworm) and it came up plug-n-play with no issues or fiddling, no doubt thanks to the new non-free-firmware setup. Transferred 20 TB over it with no problem, though it sat at ~80C the whole time - this could be due to not having sufficient airflow at that point, can't say for sure. In any case, I'd recommend you watch the temps on this one. Also note it was actually only running at 1GBit speeds for that, as the machine on the other end wasn't configured properly. But the network segment on the QFly end was 10Gbit. Then I moved the card to a Windows 10 machine and the drivers didn't come up automatically or via a Windows Update search using a different connected NIC. I had thrown out the packaging and CD at that point and couldn't find drivers online. The flash drive with the drivers comes up normally on Windows (*), and you just point Device Manager's driver search at that. Haven't put it through its paces on Windows yet, but it is working. (*) Note that if you want to mount the pack-in flash drive on linux you may have issues, since (on the one I got) there is no partition table(!) - fdisk gets confused by it and claims a nonsense partition layout because it's actually a bare filesystem, so you want to "mount /dev/sdX", NOT "mount /dev/sdX1". Don't know if automount systems can handle this gracefully or not. (Also final words: the review that says that this NIC doesn't work with "linux (pfsense)" is incorrect - the card works fine on linux, but pfsense isn't linux, it's FreeBSD. Always double-check compatibility for newer hardware before you buy if you're working with BSD, compatibility is generally worse than with linux.) No ragrets.

### ⭐⭐⭐⭐⭐ 10 Gpbs QFly on Debian 12 - 9.91 Gbps max sustatined throughput
*by T***. on April 5, 2025*

This is an initial review of the QFly 10 Gbps PCIe card on Debian 12 running kernel 12.12. No long term data available yet. The card was immediately recognized by Debian. No drivers needed to be loaded. Just needed to set IP, gateway and DNS addresses. I conducted sustained iperf3 tests through a 10G switch to a PC with the same Marvell controller chip on the motherboard. Initial sustained speeds were 9.42 Gbps (MTU=1500) until I set jumbo frames to MTU=9000 on both of the Marvell controllers. Once jumbo frames were set, sustained throughput jumped to 9.91 Gbps. The Marvell AQC113C controller chip supposedly supports 16K jumbo frames. The switch supports 12K jumbo frames which makes the switch the bottleneck for my test's max jumbo frame size. 9K jumbo frames is a 6:1 reduction (from MTU=1500) in packet headers to process. 12K would be an 8:1 reduction in packet header processing possibly squeezing out a little more throughput. Throughput was consistent with 1, 2, 10 and 20 thread iperf3 tests. The card is tiny and the heat sink appears to be doing its job. The heat sink appeared larger than the heat sinks of its competitors, thus a purchase consideration. After a sustained hour run @ 9.91 Gbps, the passive heat sink was barely warm in the center with no case fans blowing on it. CPU utilization on an i7-6700 was [4-6]% under full bandwidth iperf3 tests (depending on selected tuned profile). Initial tests were done with new short and long Cat 8 cables. A second round of tests were conducted with 10+ year old house wiring with cable lengths up to 75 feet. Throughput was the same with the old cables as it was with the new Cat 8 cables. So far so go. Now to see if it lasts. Hope this information is helpful to someone. Update: Tried 12K jumbo frames which maxed out at 9.93 Gbps sustained throughput with ZERO retries, up from 9.91 Gbps with 9K jumbo frames. See attached green highlight for 1 hour sustained max throughput test. 4.06 TBytes transferred in 1 hour.

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-01-26*