How I Built a 2.5 Gigabit Network on a Minimal Budget

Cables

Cat 5e cables are sufficient for 2.5 GbE at distances up to 100 meters. This means that in most homes the existing wiring will allow you to upgrade your home network without replacing cables. There's no need to rip open walls or lay new conduit — if your house already has Cat 5e, you're good to go.

Network Cards

More than half of modern motherboards on AM4/AM5/LGA1200/LGA1700 platforms already have built-in 2.5 Gbit adapters. Over 70% of current AM5 and LGA1700 boards include them out of the box. The most common chipsets include:

• Realtek RTL8125 — from around 1,000 rubles. The most widespread budget option for PCIe cards.
• Intel i226 — from around 1,500 rubles. A more premium choice with better driver support.
• RTL8156B — USB adapter, from 600 rubles. A convenient option for laptops and devices without free PCIe slots.
• RTL8126 and RTL8157 — 5 GbE chips with backward compatibility for 2.5 GbE. Good for future-proofing, though they may require manual driver installation.

All PCIe options require just a single PCIe 3.0 lane and need no additional power connector. USB solutions based on the RTL8156 controller range from 600 to 2,000 rubles depending on the brand and build quality.

Switches

First-generation 2.5G switches based on the RTL8371 chipset consumed excessive power and ran hot. The new generation built on the RTL8372 chip consumes only 1.5W at idle and about 0.6–0.8W per active port. This is a massive improvement.

Prices range from 1,400–2,000 rubles for no-name Chinese models to 5,000+ rubles for branded options like TP-Link. If you're on a tight budget, the unbranded switches work perfectly fine — they use the same chipset.

Testing

For real-world testing, I copied a 96.9 GB file to a NAS with two 14 TB drives in RAID 1 (mirror). The results:

• Write speed: 1.3–1.9 Gbps (approximately 160 MB/s average), bottlenecked by the mechanical drives in the NAS.
• Read speed: up to 2.4 Gbps — essentially saturating the 2.5G link.
• Real-world file transfers generally achieved 190–285 MB/s (1.2–2.4 Gbps).

4K video editing and photo workflows performed smoothly over the network, with no stuttering or buffering issues. The bottleneck consistently turned out to be the storage devices, not the network.

Conclusion

Upgrading to 2.5 Gigabit Ethernet delivers excellent performance without requiring you to replace your home wiring. The investment is minimal: a switch for 1,400–5,000 rubles, possibly a PCIe or USB adapter for 600–1,500 rubles, and you're done. If you have a NAS or regularly transfer large files between machines, this upgrade is absolutely worth it. The technology has matured, prices have dropped, and driver support on modern operating systems is solid. There's no reason not to do it now.