SlimSAS 8i to 2 x MCIO x4 38P Cable (1 Meter)

High-performance storage and compute environments are rapidly shifting toward smaller, faster, and denser interconnect solutions. One of the most widely adopted standards in enterprise servers, hyperscale data centers, and HPC environments is the SlimSAS and MCIO (Multi-Connector I/O) ecosystem.

The SlimSAS 8i to 2 x MCIO x4 38P Cable (1 meter) is a specialized interconnect designed to bridge SlimSAS 8i ports on host adapters, motherboards, or RAID cards to dual MCIO x4 (38-pin) connectors on backplanes, NVMe drives, or storage expanders. This cable delivers the high bandwidth and signal integrity required for PCIe Gen 4/Gen 5, storage-class memory, and advanced NVMe deployments.

Technical Overview

Key Specifications

• Connector A: SlimSAS 8i (SFF-8654, 74-pin)
• Connector B: 2 x MCIO x4, 38-pin (SFF-TA-1016)
• Length: 1 meter
• Lane Support: 8 PCIe lanes total, split into 2 x4 bundles
• Protocols Supported:
  • PCIe Gen 4 / Gen 5
  • NVMe (U.2 / EDSFF drives via MCIO adapters)
  • SAS-4 (24G) in certain backplane designs
• Applications: Storage arrays, servers, GPU direct storage, AI accelerators

Typical Use Cases

1. Server-to-Backplane Connectivity

Many enterprise servers use SlimSAS 8i headers on the motherboard or RAID controller to connect directly to storage backplanes. The MCIO side provides two x4 lanes, ideal for attaching NVMe SSD bays.

2. Direct NVMe Drive Connections

MCIO x4 connectors are emerging as the new standard for next-generation NVMe SSDs (EDSFF E1.S, E3.S). This cable allows host systems with SlimSAS to integrate seamlessly with MCIO-equipped drives.

3. High-Bandwidth PCIe Expansion

In GPU/AI environments, SlimSAS to MCIO cables are used to extend PCIe lanes to accelerator cards or risers, ensuring high-speed and low-latency data transfer.

4. Lab Testing & Prototyping

For engineers evaluating storage technologies, this 1m cable length provides flexibility while maintaining PCIe Gen 4/Gen 5 signal integrity during testing scenarios.

Benefits

• Signal Integrity: Designed for short-length (1m) high-speed transfers with minimal loss.
• Versatility: Compatible with PCIe and NVMe standards, offering broad deployment flexibility.
• Compact Form Factor: SlimSAS and MCIO are smaller than legacy connectors (like SFF-8639), saving board space.
• Future-Ready: Supports Gen 5 data rates, ensuring investment protection.

Q&A Section

Q1: What devices can I connect with this cable?
A: You can connect SlimSAS-enabled host adapters, RAID cards, or motherboards to NVMe backplanes, MCIO drive adapters, or next-gen EDSFF drives.

Q2: Does this cable support PCIe Gen 5?
A: Yes. The 1-meter length is optimized for PCIe Gen 4 and validated for PCIe Gen 5 (depending on board design and retimers, if required).

Q3: Can I use it with SAS drives?
A: This cable is primarily designed for PCIe/NVMe, but some backplanes may allow SAS compatibility depending on the host adapter.

Q4: Why two MCIO x4 connectors instead of a single x8?
A: SlimSAS 8i provides 8 lanes. Splitting into 2 x4 MCIOs increases flexibility—allowing you to connect two independent x4 devices, or combine them for dual-port NVMe redundancy.

Q5: What’s the difference between SlimSAS and MCIO?
A:

• SlimSAS (SFF-8654): Standardized compact connector used for 4/8 PCIe lanes.
• MCIO (SFF-TA-1016): Newer, denser connector optimized for PCIe Gen 5/6 and EDSFF.
  This cable acts as a bridge between generations.

Q6: Is 1 meter too long for Gen 5?
A: At Gen 5 speeds, longer cables may need retimers or redrivers. For most enterprise setups, 1m is within acceptable range if the system design is validated.

Q7: Can I daisy chain multiple cables?
A: No. PCIe and NVMe interconnects don’t support daisy chaining. Use direct point-to-point connections.

Conclusion

The SlimSAS 8i to 2 x MCIO x4 38P Cable (1 Meter) is an essential interconnect for modern data center and enterprise environments transitioning from SlimSAS-based motherboards and adapters to MCIO-based storage devices. Its ability to support PCIe Gen 4/Gen 5, NVMe, and compact EDSFF designs makes it an ideal choice for servers, AI compute platforms, and storage solutions.

Part # SLM-2030-MCIO