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Green circuit board with silver RJ45 port and gold M.2 edge connector

IOCrest

IOCrest Single Port 2.5 Gigabit M.2 M+B Key Ethernet Card NIC Intel I225 Chipset

SKU CH-4BWW-A3CGW

Adds a single 2.5 Gbps RJ45 port via an M.2 M+B key slot using the Intel I225 controller

  • Rated speed2.5 Gbit/s
  • Connection types1 x RJ45
  • 5 Gbps Ethernet speed for faster wired transfers
  • Intel I225 chipset reduces CPU load with advanced interrupt handling
  • M.2 M+B key fits space-constrained mobile and desktop boards
  • TSN support enables precise timing for audio, video and industrial apps
  • 5 KB Jumbo Frames cut overhead on large data streams

Single-Port 2.5G Ethernet NIC

This IOCrest card adds a 2.5 Gigabit RJ45 port to any system with an M.2 M+B key slot. It uses the Intel I225 controller to deliver multi-gigabit wired networking over standard copper cabling. The compact M.2 form factor suits space-constrained desktops, workstations and industrial boards. It is a new, single-port adapter for wired Ethernet only.

Suits builds needing 2.5G wired uplink

Ideal for users who want faster-than-Gigabit LAN on a motherboard or embedded board that lacks a 2.5G port but exposes an M.2 M+B key slot. Not for buyers who need multiple ports, fibre connectivity, Wi-Fi or Bluetooth. Not for systems without an M.2 M+B key interface or those requiring 10 Gigabit speeds. Driver support depends on the host operating system.

Handles 2.5G, 1G, 100M and 10M links

Comfortably manages 2.5GBASE-T, 1000BASE-T, 100BASE-TX and 10BASE-TE connections with 9.5 KB Jumbo Frames and 40 KB packet buffers. TCP segmentation offload up to 256 KB and IPv4/IPv6 checksum offload reduce CPU load. Runs out of headroom when aggregate throughput exceeds the single 2.5Gbps PHY or when more than one physical port is required.

How it compares

Measured against everything we stock in Ethernet Cards & NICs, at today’s prices. Recalculated every night.

Price $29.99
Cheaper than about 84% of the 1,505 comparable items (median $90.99).

Specifications

Performance
Rated speed2.5 Gbit/s
Ports & slots
Connection types1 x RJ45

Questions about this item

Does my motherboard need an M.2 slot that accepts both M and B key notches for this card?

Yes, the card uses an M.2 M+B key edge connector so the slot must support that dual-key layout.

Will the 2.5Gbps port negotiate down to my existing 1Gbps switch and Cat5e cabling?

The controller supports 2500BASE-T, 1000BASE-T, 100BASE-TX and 10BASE-TE, so it will auto-negotiate to 1Gbps or 100Mbps on older gear.

How can I confirm the adapter is actually running at 2.5Gbps after installation?

Check the link speed reported by the OS network status or the driver control panel; it should show 2.5Gbps when connected to a 2.5G-capable switch with adequate cabling.

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