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Small green circuit board with silver RJ45 port and gold edge connector

LORDWORLD

LORDWORLD 2.5G Mini PCIe to RJ45 Ethernet Adapter Realtek RTL8125B

SKU CH-M87W-WMB74

Adds a 2.5 Gbps RJ45 port to a Mini PCIe slot using a Realtek RTL8125B chip with low-profile bracket

  • 5 Gbps throughput for faster file transfers and streaming
  • Realtek RTL8125B chip delivers 2.5 Gbps with 1 Gbps/100 M/10 M auto-negotiation
  • Low-profile bracket fits diverse Mini PCIe motherboard layouts
  • Works with Windows 11, Windows 10 and Linux systems
  • Minimises electromagnetic interference and dissipates heat for stable links

What this adapter does

The LORDWORLD adapter adds a 2.5Gbps RJ45 Ethernet port to any desktop motherboard that has a Mini PCI Express slot. It uses the Realtek RTL8125B controller and auto-negotiates down to 1Gbps, 100Mbps or 10Mbps so it works with existing Cat5e or better cabling up to 100m. The low-profile bracket fits compact cases without blocking adjacent slots.

Who should buy it and who should not

Builders upgrading a Mini PCIe system to 2.5G wired networking will benefit from faster file transfers, smoother HD streaming and lower gaming latency. It also supports PXE boot, VLAN tagging and IEEE 802.3x flow control for managed networks. Buyers whose boards only have full-size PCI or PCIe slots cannot use this card. Systems without a free Mini PCIe slot or those needing fibre connectivity should look elsewhere.

Installation notes and common issues

Insert the card into a Mini PCIe slot, secure the low-profile bracket, and connect a Cat5e or higher patch cable. Windows 10, Windows 11 and Linux recognise the RTL8125B without extra drivers in most cases. The most frequent problem is confusing Mini PCIe with full-size PCIe — the card will not fit the larger slot. Ensure the slot is wired for PCIe signalling, not USB-only, or the link will not come up.

Highlights

  • 5 Gbps throughput for faster file transfers and streaming
  • Realtek RTL8125B chip delivers 2.5 Gbps with 1 Gbps/100 M/10 M auto-negotiation
  • Low-profile bracket fits diverse Mini PCIe motherboard layouts
  • Works with Windows 11, Windows 10 and Linux systems
  • Minimises electromagnetic interference and dissipates heat for stable links

Specifications

BrandLORDWORLD

Questions about this item

Does my motherboard need a Mini PCI Express slot for the RTL8125B adapter to work?

Yes, the card fits only Mini PCIe slots; standard PCI or PCI Express slots are not compatible.

Will the 2.5GBASE-T port negotiate down to 1 Gbps or 100 Mbps on my existing Cat5e cables?

The Realtek RTL8125B chip auto-negotiates 2.5 Gbps, 1 Gbps, 100 Mbps and 10 Mbps over Cat5e or better up to 100 m.

How can I verify the adapter is running at 2.5 Gbps after installing it in Windows 10 or 11?

Open the adapter properties in Device Manager and confirm the link speed shows 2.5 Gbps when connected to a 2.5G switch.

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