Product Overview

This adapter card is built on the B650 chipset, turning a native motherboard chipset into a standard PCIe expansion device. Through a single PCIe 4.0 x4 upstream interface, it expands to: on the front, one 20Gbps USB-C port, one 10Gbps Type-E port, and two M.2 slots (M_B/M_D, PCIe 3.0 x2, supporting 2230/2242/2260/2280 lengths, fitting standard SSDs); on the back, two M.2 slots (M_A/M_C, PCIe 4.0 x4, supporting 2280/22110 lengths). An onboard 6-pin auxiliary power connector improves the stability of high-power USB output (optional — recommended when connecting high-power USB devices). Suitable for high-end desktops, workstations, media production, NAS, and gaming builds, it delivers an all-in-one expansion solution for high-density storage and high-speed peripherals.

Features

• PCI Express

  - PCIe Gen4 x4（64Gbps Theoretical Uplink Bandwidth）, backward compatible with Gen3/Gen2/Gen1

  - Supports a data transfer rate of 16 GT/s per lane

  - Supports three power-saving modes: L0, L1, and L1SS

  - PCI MSI, MSI-X, ASPM, AER, LTR, VC

• 1 × USB-C (20Gbps) port / 1 × Type-E (10Gbps) onboard header

  - Full xHCI 1.1 feature support; compatible with legacy keyboard and mouse devices

  - Supports wake from S3 / S4

  - Individual port disable via independent control

  - Onboard 6-pin auxiliary power connector: be sure to connect the 6-pin power cable when using high-power USB devices. The 6-pin connector only addresses the power delivery ceiling — it does not change the 64Gbps shared bandwidth

• 4 × M.2 slots

  - Compliant with PCI Express Base Specification Rev 4.0; compliant with PCI Express M.2 Specification Rev 1.1

  - Supports PCI Express Link Power Management

  - Supports M.2 M-Key

  - Front M.2 slots (M_B, M_D): PCIe 3.0 x2, supporting 2230 / 2242 / 2260 / 2280 lengths (function-module slots; standard SSDs also supported)

  - Rear M.2 slots (M_A, M_C): PCIe 4.0 x4, supporting 2280 / 22110 SSDs

Note: The front M_B/M_D and rear M_A/M_C slots have different lane specifications. Install each device in the slot that matches its performance requirements.

System Support

• Windows

• Linux

• Mac OS

Complete Package Contents

1 x LEKUO SouthBridge Extend

1 x User Manual

10 x Screws

2 x 4.0 Copper Stands

2 x 3.65 Copper Stands

1 x Short Metal Plate