SlimSAS 8i SFF-8654 to 2 × SFF-8639 U.3 Cable – 1 Meter: High-Density, High-Performance NVMe Connectivity
Modern data centers and enterprise storage systems demand high-bandwidth, scalable solutions for NVMe drives. The SlimSAS 8i SFF-8654 to 2 × SFF-8639 U.3 Cable – 1 Meter addresses this need by providing a reliable connection between a SlimSAS 8i host port and two U.3 NVMe SSDs. Designed for PCIe Gen 4.0 and compatible with Gen 5.0, this cable ensures maximum throughput, minimal latency, and superior signal integrity for high-performance workloads.
Technical Overview
This cable converts a SlimSAS 8i (SFF-8654) connector into two SFF-8639 U.3 connectors, effectively splitting a single port into two independent NVMe device paths. It is optimized for 1-meter routing inside server or storage chassis.
- Cable Length: 1 meter (optimal for rack-mounted server and storage layouts).
- Connector A: SlimSAS 8i (SFF-8654, supporting 8 lanes of PCIe).
- Connector B: 2 × U.3 SFF-8639 (NVMe SSD).
- Supported Protocols: PCIe Gen 4.0, backward-compatible with Gen 3.0; NVMe and SAS/SATA if supported by host.
- Applications: High-speed storage arrays, RAID/NVMe expansion cards, and server backplane connections.
- Construction: Shielded cable with impedance-matched pairs, designed to maintain signal integrity over 1 meter.
This setup allows a single SlimSAS 8i controller port to support two NVMe drives, doubling storage connectivity without additional ports.
Key Benefits
- High-Speed Data Transfer – Supports full PCIe Gen 4.0 x4 per U.3 link for maximum throughput.
- Dual Drive Connectivity – One SlimSAS 8i port can interface with two NVMe U.3 SSDs, increasing storage density.
- Flexible Installation – 1-meter cable provides optimal routing for server racks and storage enclosures.
- Signal Integrity – Precision shielding and controlled impedance reduce crosstalk, interference, and latency.
- Versatile Protocol Support – Compatible with NVMe SSDs and, depending on host, SAS/SATA devices via U.3 connectors.
Common Uses
- Enterprise Storage Arrays: Connect SlimSAS 8i controllers to multiple U.3 NVMe SSDs for scalable high-performance storage.
- High-Performance Computing (HPC): Enables fast storage access for AI, analytics, and simulation workloads.
- Server Backplanes: Efficiently splits a single controller port into two U.3 SSD connections for compact storage enclosures.
- Data Center Expansion: Allows administrators to maximize the use of existing SlimSAS 8i ports while adding more drives.
- Development & Testing: Ideal for engineers testing dual NVMe drive performance on single-host systems.
Q&A Section
Q1: What is the difference between SlimSAS 8i and U.3 connectors?
A: SlimSAS 8i (SFF-8654) is a high-density host connector supporting up to 8 PCIe lanes per port. U.3 (SFF-8639) is a versatile connector for NVMe, SAS, and SATA drives, commonly used in enterprise storage drives. This cable bridges the two standards.
Q2: Can this cable support PCIe Gen 5.0?
A: While primarily designed for PCIe Gen 4.0, high-quality cables like this one can support Gen 5.0 in short-range applications depending on the signal integrity and system configuration.
Q3: Is this cable backward compatible with PCIe Gen 3.0?
A: Yes. The cable supports backward compatibility with PCIe Gen 3.0, although speeds will be limited to the Gen 3 bandwidth.
Q4: Why would I need a cable that splits SlimSAS into two U.3 drives?
A: It allows a single controller port to connect to two independent NVMe drives, increasing drive density and making the most of available ports in storage arrays or server backplanes.
Q5: Can I use this cable with SAS or SATA U.3 drives?
A: Yes, if the host controller supports SAS/SATA protocols over the U.3 connector. For NVMe-only hosts, only NVMe drives will work.
Q6: Why is a 1-meter length ideal?
A: 1 meter is long enough to route inside standard server chassis or storage racks, while short enough to minimize signal loss and maintain PCIe/NVMe performance.
Final Thoughts
The SlimSAS 8i SFF-8654 to 2 × SFF-8639 U.3 Cable – 1 Meter is an essential component for modern enterprise storage and HPC systems. By enabling dual NVMe connectivity from a single host port, it provides scalable, high-speed storage solutions while preserving signal integrity and performance. Ideal for data centers, cloud platforms, and development labs, this cable bridges legacy and modern storage standards seamlessly.
Part # SLM-1916-2XU3