SFF-8654
- Supports 24Gbps SAS 4.0 and NVMe-oF for all-flash array performance.
- Available in 4i (4-lane) and 8i (8-lane) configurations for flexible bandwidth.
- Compact SFF-8654 Slimline connector saves internal server space.
- Backward compatible with SAS 3.0, SATA III, and other legacy interfaces.
- Multi-layer shielding ensures signal integrity at 24Gbps speeds.
- Multiple interface options: to 4x/8x SATA, SFF-8087/8639/8643/8482/8644.
- 8i to dual SFF-8644 model enables high-bandwidth external expansion.
- Industrial-grade LCP material and gold-plated contacts for reliability.
- Designed for AI/HPC and high-end enterprise storage applications.
- Full OEM/ODM customization support for complete solutions.
SFF-8654 Cable: Next-Generation 24Gbps Mini SAS Connectivity for SAS 4.0 & NVMe
Introducing the next generation of enterprise storage connectivity: The Bespoke SFF-8654 Cable series. Designed to support the high throughput required by SAS 4.0 (24 Gbps) and NVMe (PCIe 4.0 x4) over fabric, the SFF-8654 (Mini SAS Slimline) connector is the bedrock for next-generation high-density storage systems. The product family comprises 14 configurations divided into two major types: SFF-8654 4i (4-lane) for standard drive applications and SFF-8654 8i (8-lane), which doubles the bandwidth and supports more performance-oriented applications. These cables provide important links between current 4x/8x SATA, SAS-1, and SAS-2 HBAs and RAID controllers on one end and a wide variety of drives/backplanes, including 4x/8x SATA (as previously mentioned), legacy SFF-8087, U.3/SAS-4 SFF-8639, 12Gbps SFF-8643, or single-drive SFF-8482s, as well as external ones via the SFF–86444 interface. Meticulously crafted for maximum signal integrity at ultra-high Richter-level speeds, these cables are crucial for all-flash arrays, AI/ML storage nodes, and HPC clusters.
Technical Specifications
| Parameter | Specification |
| Primary Connector | Mini SAS Slimline (SFF-8654) Male, 4i (4-lane) or 8i (8-lane) variants |
| Protocol Support | SAS 4.0 (24Gbps), NVMe over Fabric (PCIe 4.0 x4), Backward compatible with SAS 3.0/2.0, SATA III |
| Product Series | 4i Series (4 lanes), 8i Series (8 lanes, for 2x bandwidth or 8 drives) |
| Cable Length | 0.5m, 0.7m, 1m standard (Custom lengths available) |
| Data Transfer Rate | Up to 24 Gbps per lane (4i: ~96 Gbps aggregate, 8i: ~192 Gbps aggregate) |
| Connector Material | High-temp LCP housing, gold-plated contacts |
| Cable Shielding | Individual & overall foil + braid shielding, optimized for 24Gbps |
| Cable Jacket | Low-loss, flexible PVC, UL94V-0 rated |
| Latching Mechanism | Robust positive-click latch |
| Operating Temperature | 0°C to +70°C |
| Compliance | SFF-8654 specification, CE, RoHS |
Product Configuration Guide
| Series | Model | Connector A | Connector B | Key Application |
| 4i Series | SFF-8654 4i to 4 SATA | SFF-8654 4i Male | 4x SATA 7-pin Female | Connect 4 SATA SSDs/HDDs to a 4-lane SFF-8654 HBA. |
| SFF-8654 4i to SFF-8087 | SFF-8654 4i Male | SFF-8087 Male | Bridge the new 4-lane controller to the legacy 12Gbps SFF-8087 backplane. | |
| SFF-8654 4i to SFF-8639 | SFF-8654 4i Male | SFF-8639 Male | Connect to U.3 (NVMe/SAS) dual-port drive or SFF-8639 backplane. | |
| SFF-8654 4i to SFF-8643 | SFF-8654 4i Male | SFF-8643 Male | Connect to 12Gbps SFF-8643 (Mini SAS HD) backplane. | |
| 8i Series | SFF-8654 8i to 8 SATA | SFF-8654 8i Male | 8x SATA 7-pin Female | Connect 8 SATA drives to a high-density 8-lane port. |
| SFF-8654 8i to 90° 8 SATA | SFF-8654 8i Male | 8x SATA 7-pin Female (90°) | 90-degree SATA connectors for ultra-dense 1U/2U servers. | |
| SFF-8654 8i to SFF-8087 | SFF-8654 8i Male | 2x SFF-8087 Male | Split 8-lane bandwidth to two legacy 4-lane SFF-8087 backplanes. | |
| SFF-8654 8i to SFF-8639 | SFF-8654 8i Male | 2x SFF-8639 Male | Connect to two U.3 NVMe/SAS drives or backplanes. | |
| SFF-8654 8i to SFF-8643 | SFF-8654 8i Male | 2x SFF-8643 Male | Connect to two 12Gbps SFF-8643 backplanes. | |
| Specialty | SFF-8654 to SFF-8482 | SFF-8654 4i Male | SFF-8482 Female | Directly connect to a single enterprise SAS/SATA drive. |
| SFF-8654 to SFF-8482 w/ Power | SFF-8654 4i Male | SFF-8482 Female + Molex 4-pin | Direct connect + power delivery for a single drive. | |
| SFF-8654 to SFF-8644 | SFF-8654 4i Male | SFF-8644 Male | Connect the internal SFF-8654 to the external 12Gbps SFF-8644 JBOD. | |
| SFF-8654 to Dual SFF-8644 | SFF-8654 8i Male | 2x SFF-8644 Male | Split an 8-lane to two external SFF-8644 ports for high bandwidth. | |
| SFF-8654 to SFF-8654 | SFF-8654 4i/8i Male | SFF-8654 4i/8i Male | Direct cable between two SFF-8654 ports (HBA to backplane). |
Design Features
The series of SFF-8654 cables is specifically designed for ultra-high-speed 24Gbps SAS 4.0 and NVMe connectivity. The foundation of the series is the small-form-factor SFF-8654 Slimline connector, released in both 4-lane (4i) and 8-lane (8i) varieties, enabling far higher port density than in preceding generations. These connectors sport a tough positive-click latching mechanism and are made with high-temperature LCP (Liquid Crystal Polymer) housings and gold-plated contacts for ideal signal integrity. This includes 4i/8i to 4x/8x SATA breakouts, SFF-8087/8639/8643/8482/8644 adapters, and direct SFF-8654 cables—fourteen configurations in total. The 8i-to-8 SATA model also offers a 90-degree version, designed for high-density chassis. Each cable has individual and overall foil-and-braid multi-layer shielding matched to 24Gbps frequencies, all wrapped in low-loss, high-flex PVC jackets.
Application
SFF-8654 cables are the backbone of next-generation, high-performance storage infrastructure. They are primarily used to connect 24Gbps SAS 4.0 or NVMe-oF HBAs/RAID controllersto the drive backplanes in both All-Flash Arrays (AFA) and NVMe JBOFs (Just a Bunch of Flash). The need for maximum throughput in AI/ML training clusters and HPC storage nodes makes the 8i series, with 2× doubled bandwidth, a must-have. Single breakout cables (to SATA) allow modern controllers to connect to large pools of high-capacity SATA SSDs. SFF-8087, SFF-8643, and SFF-8639 (U.3) adapters will enable phased infrastructure upgrades and the use of NVMe/SAS dual-port drives. The SFF-8644 cables are also used for high-speed external expansion and are indispensable in broadcast and media workstation 8K+ video editing storage, as well as storage test/development labs.
Quality & Testing
Because of the extreme 24Gbps data rates, every SFF-8654 cable goes through an exhaustive, multi-phase validation process. This includes 100% continuity and functional testing per lane (4 or 8 lanes). One vital part of this process is Signal Integrity Validation, in which Vector Network Analyzer (VNA) testing measures insertion loss, return loss, and crosstalk to verify that the design meets the stringent SFF-8654 specification when operating at 24Gbps. Mechanical durability is evaluated via batch testing for latch engagement cycles (a few thousand insertions) and cable flex life. All raw materials are RoHS- and REACH-compliant, and each production lot is tested for EMI shielding efficacy. Physical and electrical parameters for compliance with the SFF-8654 specification are stringently verified.
OEM/ODM Services
As an OEM manufacturer, we provide free OEM services to B2B clients designing new, leading storage systems. You can customize the length of cables (from 0.3m and up) or request connectors such as SATA or other connector angles that are not standard at 90 degrees, so they can fit your chassis. Also, custom breakout configurations (8i to 4x SFF-8639) are available. Using its proprietary technology, high-volume clients can request fully custom connector molding, specialized jacket materials for extreme environments, and custom branding via laser etching. We also offer custom packaging, from ESD-safe bags to retail clamshells. Our engineering staff is ready, willing, and able to support the co-development of unique cable solutions through a formal prototyping, sample approval, and performance validation workflow.
How to Install the SFF-8654 SAS Cable?
Power Down and Electrostatic Discharge (ESD) Safety
Now shut down the server and storage completely. You must wear an ESD wrist strap when handling components, especially static-sensitive 24Gbps HBAs and drives.
Find Ports & Route Plan
Find the SFF-8654 (4i or 8i) port on your HBA/RAID card. Determine the destination port(s) (SATA or SFF-8087). Avoid sharp bends, pinch points, or anything that would obstruct airflow through and/or around the connect.
Connect Controller End
Use the SFF-8654 connector on your controller. The connector has a keying feature to ensure correct orientation. Make sure you pressed it down evenly and firmly until you hear an audible click sound from the latch, confirming a firm connection. Avoid applying excessive force.
Connect Target End(s)
- For SATA Breakout
- Attach each clearly numbered SATA connector to its corresponding drive, ensuring that the latch—if present—is fully engaged. For the 8i to 8 SATA, keep that cable bundle nice and tidy.
- For SFF-8087/8639/8643/8482/8644
- Insert the cable into its respective port, then click the positive-click latch to complete the secure connection.
SFF-8482 Molar Power
And the SFF-8482 to the drive and a 4-pin Molex connector to an open psu cable for power.
Cable Management
This involves routing and securing the cables neatly into cable management brackets to minimize strain against any connectors, using things like chassis tie-downs. Use a separate conduit for the 24Gbps cables, if possible, to avoid tightly bundling them with power cables, which could cause electromagnetic interference.
Power On & Initialize
After all connections are secured, please switch on the system. Enter the HBA/RAID controller (e.g., LSIutil or vendor-specific GUI) to make sure all attached drives are detected and functioning at the correct link speed, e.g., 24Gbps or 12Gbps
User Experience
Our SFF-8654 cables offer reliable, plug-and-play compatibility with next-gen HBAs from Broadcom and Microchip, as reported by system integrators and engineers working with these state-of-the-art storage platforms. The build quality also deserves a shout-out; the precision of the Slimline connector and positive action of the latch are essential for 24Gbps link stability. The 4i and 8i variants, as well as the “from 8i to both SFF-8644s” cable, are often praised for addressing specific high-bandwidth design needs that off-the-shelf cables cannot meet. During all-flash array validations, users verify that there are no link training errors or dropouts, and that cables perform reliably at full 24Gbps speeds. In addition, the clear lane and channel numbering found on complex breakout cables is considered handy for installation in tight 1U/2U servers. Feedback casts these cables as important, decorator-grade elements in the future of SAS 4.0 and NVMe-oF infrastructure deployments.
Similar Products Show & Comparison
- Fourteen Products for Your selection of SFF-8644 SAS Cable
The 4i has four data lanes and is commonly used to connect four SATA drives or one x4 NVMe/SAS target, similar to the SFF-8643. The 8i, on the other hand, features eight data lanes—effectively doubling the bandwidth. This enables connectivity for up to eight SATA drives, two 4-lane targets (via two SFF-8087 ports), or lane aggregation for a single high-bandwidth device.
Yes. The SFF-8654 connector supports PCIe signaling for NVMe over Fabric. Our SFF-8654 4i-to-SFF-8639 cable is intended to connect a U.3 (SFF-8639) dual-port NVMe/SAS drive, while the 8i-to-dual SFF-8639 cable connects two such drives.
Yes. Electrically, they are all fully backward compatible. Depending on the type of connected device (e.g., SAS 3.0 or SATA III), an SFF-8654 HBA will negotiate down to that speed. This compatibility is aided by our breakout cables to SATA or SFF-8087/8643.
This cable connects a server with an 8-lane SFF-8654 external port to two independent external JBODs with SFF-8644 ports. In fact, it splits one high-bandwidth external port into two to gracefully expand the end-user connectivity.
For 24Gbps performance, we recommend no longer than 1 m. Longer lengths remain possible for 12Gbps or lower speeds. 0.5m and 0.7m options come as standard, targeted for dense server scenarios.
In general, it is designed for SAS drives with the SFF-8482 interface. A standard SATA drive will not connect to an SFF-8482 port without an interposer, even though the drives are electrically compatible.
A SAS controller can talk to both SAS and SATA drives, but it’s not really standard practice to mix them up on the same cable or port if you’re trying to build a single storage volume, and support for such a thing from the controller itself can be hit-or-miss. Check your HBA doc for the exact process.
Our regular MOQ is 100 pcs per SKU. Paring plan for mixed-SKU orders + strategic partnerships
Yes, we offer samples to eligible B2B customers for compatibility and performance testing on target hardware.
Absolutely. We are an OEM customization manufacturer. And we can make cables with any required angle of the SATA connector (down, left, right, or up), depending on your chassis layout.
Message decryption ensures your complex set of links over this powerful highway remains unblemished, while you compete in the next-generation data infrastructure arms race, where speed and bandwidth are everything. Bespokecable – The definitive SFF-8654 Series SAS Cables, engineered for the premier manufacturer and direct factory in China, supporting the world’s most advanced enterprise storage applications. Our product range is tailored for SAS 4.0 (24Gbps) and NVMe over Fabric performance, with high-bandwidth SFF-8654 8i and 4i configurations. From basic SFF-8654 to SAS breakout cables, as well as sophisticated adapters for both legacy and next-gen topologies — we deliver vital ultra-high-speed data highways required by all-flash arrays, AI/ML clusters, and high-performance computing. Our volume pricing is so competitive on a wholesale basis that we truly become the global partner of choice for not only system integrators and OEMs, but also data center operators looking to source the cables they can depend on…the ones which will ultimately define storage performance over the next decade.
Every SFF-8654 cable is designed at our ISO 9001:2015 certified production plant. With unbeatable aggregate bandwidth, our SFF-8654 8i cables offer double the lane count, and SFF-8654 4i variants set the bar for high-density drive connections. All cables are tested for signal integrity before leaving our facility to ensure they operate at 24Gbps without issues. With our SATA Cable range, improve your state-of-the-art SAS infrastructure by adding robust legacy and internal solutions, and complement them with our professional eSATA Cable for external connectivity. We also have our SATA 3 Cable for power users who need added speed, and our Laptop SATA Cable for mobile or small-form-factor applications.
When it comes to SFF-8654 and its total inclusiveness, you best yourself by going with Bespokecable — because the kind of performance you’re producing is critical for things like AI, real-time analytics, and massive-scale data crunching. Our cables are the trusted link between 24Gbps controllers and next-generation storage media, maintaining a continuous data stream that professionals who cannot afford bottlenecks rely on. Work with the factory that constructs tomorrow’s data, today — reach out to us about your project, request evaluation samples, or volume purchase!
This cable is the optical data bus for 24Gbps SAS 4.0 and NVMe over Fabric (NVMe-oF) systems. It drives all-flash arrays, AI/ML training clusters, and enterprise storage servers. Choosing poorly can result in incompatible failures or even signal integrity problems at 24 Gbps speeds, for a product that occupies valuable rack real estate. With data through October 2023, this professional handbook enables you to navigate what really matters — the key technical and practical criteria to consider — so you can ensure the SFF-8654 cable fits your application as closely as possible for performance and return on investment.
- Choose Between Lane Configuration: 4i or 8i
The primary difference is between the SFF-8654 4i (4-lane) and SFF-8654 8i (8-lane). 4i variant is the default for a single connection to a 4-lane target, which would be a U.3 (SFF-8639) dual-port drive or a backplane with four SATA drives. The 8i variant is, instead, half the name above, touting double the bandwidth in two cases: draping up to eight individual SATA/SAS drives off a breakout cable or aggregating lanes to maximum throughput to a single high-performance storage controller or expander. Choose the wrong lane count and you’ll either bottleneck your performance or leave expensive HBA ports underutilized. - Map Exactly Your Target Device and Connector
After determining the number of lanes, we need to identify the physical interface used by our connected device. Your HBA has an SFF-8654 port; the other side needs to be compatible with your storage hardware. Is connectivity to an existing legacy 12Gbps SFF-8087 or SFF-8643 backplane required for an upgrade path? Do you use the newest U.3 NVMe/SAS drives (which need an SFF-8639 cable)? Or does your need have a high-density breakout for 4 or 8 SATA SSDs/HDDs? You will need an SFF-8654 to SFF-8644 cable for external connectivity to a 12Gbps JBOD. Failing to correctly identify the target connector results in costly and time-consuming mistakes. - Signal integrity and build quality validation for 24Gbps
Not every SFF-8654 cable is guaranteed to reliably support 24Gbps signals. Above this frequency, ensuring signal integrity becomes critical. Look for cables from manufacturers that list SAS 4.0 (24Gbps) and NVMe compatibility and use high-quality materials – including high-temperature LCP connectors, multi-layer individual/overall shielding (foil + braid), and gold-plated contacts. It should be strong enough not to disconnect from a mobile machine operating in a harsh-vibration environment. Flexibility with a slim profile is also important for cables that will be pulled into tight spaces in 1U/2U servers, such as our SFF-8654 8i to 90-Degree 8 SATA. - Consider Application-Specific Features and Length
Evaluate your specific deployment needs. Right-angle or 90-degree connectors (such as SATA breakouts) are often required in ultra-dense all-flash arrays to avoid obstructions from neighboring components. A power-delivery-capable cable, such as an SFF-8654-to-SFF-8482 (Molex) cable, would ease cabling for test benches or direct-attach scenarios. Select the minimum cable length that permits strain-free, tidy routing with no excess slack; for 24Gbps performance, shorter lengths (0.5m, 0.7m) are usually preferable to longer runs to reduce serial signal attenuation. - Work with a certified Manufacturer to achieve B2B goals
For enterprise infrastructure, you need to buy from a specialist manufacturer, not a general distributor, and certainly not an anonymous faceless manufacturer. A partner like Bespokecable: an ISO 9001:2015-certified factory with over 20 years of experience, gives you peace of mind for quality, reliable specs, and compliance (CE, RoHS). When it comes to B2B procurement, offerings that leverage competitive bulk pricing, full OEM/ODM customization for special angles or lengths, and quick sample programs are priceless. They make sure the cable works on day one and is integrated into your supply chain and product life. A good cable from a technical partner protects your larger investment in servers, HBAs, and costly NVMe/SAS drives. Check out more of our compatible solutions to round out your storage ecosystem, including our trusted SATA Cable range for accurate SATA drive connections.
