Intel 226-V vs. Realtek RTL8125B for Proxmox and TrueNAS

This review compares the Intel 226-V and Realtek RTL8125B 2.5GbE network cards, evaluating their suitability for self-hosted Proxmox and TrueNAS environments based on reported Linux support, stability, and CPU usage.

TL;DR

Best for: The Intel 226-V is the superior choice for Proxmox and TrueNAS servers, prioritizing stability and lower CPU overhead, crucial for always-on systems like the HP Elitedesk G4 mini and i3 7100 desktop. Skip if: You are on a strict budget and willing to troubleshoot potential driver quirks or accept slightly higher CPU utilization with the Realtek RTL8125B. Bottom line: For server applications, the Intel 226-V offers a more reliable and efficient 2.5GbE experience despite its higher cost.

Methodology

This v0 review draws on the user's reported claims from various forums and reviews regarding the Intel 226-V and Realtek RTL8125B 2.5GbE network cards. The signal was ingested on 2026-05-21. We cover the user's specific concerns about Linux support, stability, and CPU usage in the context of Proxmox and TrueNAS. The review also considers the specified form factors: M.2 E+M for the HP Elitedesk G4 mini (Proxmox) and a PCIe card for the TrueNAS desktop (i3 7100). What is not covered in this initial assessment includes independent performance benchmarks, long-term workflow integration, specific driver version compatibility testing, or power consumption metrics. Update cadence: re-tested when claims diverge from observed behavior.

What It Does

Intel 226-V: A server-grade option

The Intel Ethernet Controller I226-V is Intel's current generation 2.5 Gigabit Ethernet solution, designed to address some of the issues present in its predecessor, the I225-V. It supports 2.5Gbps, 1Gbps, 100Mbps, and 10Mbps speeds. Intel NICs generally have a strong reputation for driver maturity and stability, especially within server operating systems like Debian-based Proxmox and FreeBSD-based TrueNAS. The 226-V is available in various form factors, including PCIe expansion cards and integrated motherboard solutions, making it suitable for both the user's HP Elitedesk G4 mini (if an M.2 E+M adapter is available) and the TrueNAS desktop.

Realtek RTL8125B: A budget-friendly alternative

The Realtek RTL8125B is a widely adopted 2.5GbE controller, frequently found in consumer-grade motherboards and more affordable PCIe expansion cards. It also supports multiple speeds, including 2.5Gbps. Realtek chips are known for their cost-effectiveness, making 2.5GbE more accessible. While Realtek's Linux driver support has historically been more variable than Intel's, it has significantly improved for newer chips like the RTL8125B. The user notes that some forums claim better Linux support for Realtek, while others praise Intel's stability.

Form factor considerations

The user plans to use an M.2 E+M slot for the HP Elitedesk G4 mini and a standard PCIe card for the TrueNAS desktop. Both Intel and Realtek offer solutions in PCIe form, but M.2 E+M network cards are less common, typically reserved for Wi-Fi. Finding a reliable 2.5GbE M.2 E+M card for either chip requires careful vendor selection and driver verification.

What's Interesting / What's Not

What is interesting is the user's direct observation of conflicting advice regarding Linux support and stability. The claim that Realtek has

Pull quote: “The Intel 226-V is the superior choice for Proxmox and TrueNAS servers, prioritizing stability and lower CPU overhead, crucial for always-on systems like the HP Elitedesk G4 mini and i3 7100 desktop.”