The UGREEN M.2 M-Key + M.2 B-Key to PCI-E 3.0 x4 Expansion Card is a versatile dual-slot desktop storage solution designed to connect both NVMe and SATA M.2 SSDs simultaneously to your motherboard. Distributed by Keyphantom, this adapter features an M-Key slot running on a high-speed PCIe 3.0 x4 interface (up to 32Gbps) for NVMe drives, alongside a B-Key slot that connects via SATA 7-pin cable to support legacy SATA M.2 SSDs (up to 6Gbps). Supporting multiple drive lengths (2230 to 2280), gold-plated contacts, and dual mounting brackets, it is the ultimate expansion card for custom PC upgrades and data recovery.

  • Dual M.2 Slot Design: Accommodates one M.2 NVMe (M-Key) drive and one M.2 SATA (B-Key / B+M Key) drive at the same time.
  • Ultra-Fast 32Gbps NVMe Channel: PCIe 3.0 x4 lane interface delivers up to 32Gbps bandwidth for NVMe SSDs.
  • SATA Interface Connectivity: Integrated B-Key slot routes via standard SATA cable (included/required) directly to motherboard SATA ports.
  • Multi-Size SSD Support: Fits 2230, 2242, 2260, and 2280 form-factor M.2 drives across both slots.
  • Gold-Plated Signal Protection: Immersion-gold PCB layer optimizes heat dissipation, structural durability, and electrical connection.

UGREEN Dual M.2 to PCIe Card: Simultaneous NVMe & SATA Storage Expansion

The UGREEN M.2 M-Key + M.2 B-Key to PCI-E 3.0 x4 Expansion Card provides a comprehensive 2-in-1 desktop storage upgrade. Distributed by Keyphantom, this adapter board allows PC builders to run high-speed NVMe storage alongside affordable SATA M.2 drives using a single motherboard expansion slot.

Dual Protocol Support (NVMe & SATA)

This expansion adapter solves drive compatibility bottlenecks by housing two distinct M.2 interfaces on one board. The M-Key slot taps into the motherboard's PCIe 3.0 x4 slot to power ultra-fast NVMe SSDs, while the B-Key slot uses a 7-pin SATA connector to interface directly with onboard SATA controllers.

Universal Form Factor Compatibility & Sturdy Build

Built with high-grade PCB material and gold-plated contacts, the card ensures low data latency and maximum signal stability. Its multi-hole mounting layout accepts 2230, 2242, 2260, and 2280 drive sizes, while included full-height and half-height brackets ensure a seamless fit into full-size desktop towers and small-form-factor (SFF) PCs alike.

Technical Summary Table

Feature Specification
Model Name UGREEN M.2 M-Key + M.2 B-Key to PCI-E 3.0 x4 Expansion Card
Model / SKU Number 70504 / CM302 Dual Series
Brand Keyphantom (UGREEN)
M-Key Slot Interface PCIe 3.0 x4 (32Gbps Max) for M.2 NVMe SSDs
B-Key Slot Interface SATA III 7-Pin (6Gbps Max) for M.2 SATA SSDs
Motherboard Slot Support PCIe x4, x8, x16 Slots (PCIe 4.0 / 3.0 / 2.0 compatible)
Supported SSD Form Factors Type 2230 / 2242 / 2260 / 2280 M.2 Drives
Simultaneous Drive Operation Yes (Supports NVMe PCIe drive + SATA M.2 drive concurrently)
PCB Features Immersion Gold PCB + Dual LED Status Indicators
OS Support Windows 11 / 10 / 8 / 7, macOS, Linux (Plug & Play)
Included Accessories Full & Low-Profile Brackets, Mounting Screws, SATA Cable