This article covers ICYDOCK EXLink 信号補正用 Redriver 搭載 PCIe 4.0 x4 スロット対応 SlimSAS 4i（SFF.
Overview
The ICYDOCK EXLink MB408A4 is a conversion adapter card designed to connect NVMe storage to PCIe slots. It features a PCIe Gen4 x4 interface with up to 64Gbps total bandwidth. An integrated Redriver compensates for signal degradation over longer cabling distances, ensuring reliable data transmission. The card supports SlimSAS 4i (SFF-8654) connectors, making it compatible with high-performance NVMe drives. It is backward compatible with PCIe 2.0/3.0/4.0/5.0 slots, offering flexibility for various system generations. ## Specifications | Item | Specification | |------|---------------| | Interface | PCIe Gen4 x4 | | Connector | SlimSAS 4i (SFF-8654) | | Max Bandwidth | 64Gbps | | Host Slot Support | PCIe 2.0 / 3.0 / 4.0 / 5.0 (x4 physical) | | Signal Conditioning | Redriver | | Clock Buffer | 100MHz PCIe clock buffer | | Signal Buffering | PERST#, WAKE#, CLKREQ#, SMBCLK, SMBDAT | | Controller Compatibility | Tri-mode HBA/RAID (SFF-9402 Rev 1.1 pin-out) | | Included Bracket | Full-height bracket |
Connectivity & Compatibility
The card installs into any PCIe slot (x4 or larger) and connects to NVMe drives via SlimSAS cables (SFF-8654). Bandwidth is limited by the PCIe generation of the slot. It works with Tri-mode HBA/RAID controllers that follow the SFF-9402 Rev 1.1 pinout. The included full-height bracket fits standard PC cases.
Product Info
The ICYDOCK EXLink MB408A4 is sold as a retail unit, available on for approximately ¥25,300. It carries a 1-year send-back warranty. Accessories include only the full-height bracket; SlimSAS cables and NVMe drives must be purchased separately. Market positioning places it as a mid-to-high-tier accessory for users who need flexible PCIe-based NVMe storage connectivity, with the Redriver feature enhancing signal integrity over longer distances. Purchase link: View on
Best Use Cases
Users who want to attach high-speed NVMe SSDs directly to PCIe slots for maximum throughput, bypassing built-in M.2 slot limitations. System builders running long cable runs in servers or multi-drive enclosures where signal degradation is a concern. Enthusiasts using Tri-mode HBA/RAID cards who need a reliable SlimSAS adapter for flexible storage topologies. Those upgrading older systems with PCIe 2.0/3.0 slots but planning to migrate to newer platforms while reusing NVMe drives.