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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

  • Speed2.5Gbps
  • Connectors1 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.

Highlights

  • 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

Specifications

Speed2.5Gbps
Connectors1 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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