High-performance storage, AI/ML workloads, and data-intensive applications demand fast, low-latency interconnects. The MCIO x8 74P to 2X Oculink 4i Cable (1 Meter) is designed to bridge modern server platforms, accelerators, and storage devices while adhering to the latest high-speed standards.
What is the MCIO x8 74P to 2X Oculink 4i Cable?
- MCIO (Multi-lane Cable IO):
A next-generation server interconnect standard, often used for PCIe Gen4/Gen5 signaling in compact form factors. The x8 74P indicates an 8-lane configuration with a 74-pin connector. - Oculink 4i:
A compact connector defined by the PCI-SIG, used for PCIe and NVMe connectivity. The “4i” version typically carries 4 PCIe lanes, enabling high-speed data transfers with minimal signal loss. - This cable:
Converts a single MCIO x8 74P port into two Oculink 4i ports, effectively splitting 8 lanes into two 4-lane connections.- Length: 1 meter (ideal balance between reach and signal integrity).
- Bandwidth: Supports PCIe Gen4/Gen5, delivering up to 64 GT/s aggregate depending on host and device capabilities.
Key Use Cases
1. NVMe Storage Expansion
Modern servers often rely on hot-swappable NVMe drives. This cable allows a host platform with MCIO ports to connect directly to dual Oculink-enabled NVMe SSDs or backplanes.
2. GPU/Accelerator Connectivity
AI accelerators and edge inference cards with Oculink interfaces can be connected via this cable, leveraging PCIe Gen4/Gen5 lanes for high throughput.
3. Server-to-JBOF (Just a Bunch of Flash) Systems
Data centers deploying JBOF enclosures often use Oculink for front-end drive access. This cable enables compact, high-density connectivity.
4. Compact HPC and Edge Deployments
In 1U or 2U servers where space is limited, MCIO and Oculink provide dense, low-loss cabling solutions.
Technical Advantages
- High Signal Integrity:
Designed for PCIe Gen4/Gen5, minimizing crosstalk and insertion loss even at 1-meter length. - Lane Flexibility:
Splits MCIO x8 into two independent x4 links, perfect for NVMe dual-port setups. - Hot-Plug and Scalability:
Supports environments where devices may need to be added/removed without downtime. - Reduced Footprint:
Compared to traditional Mini-SAS HD, MCIO + Oculink reduces bulk, improving airflow in dense servers.
Frequently Asked Questions (Q&A)
Q1: What bandwidth does this cable support?
- Each Oculink 4i supports PCIe Gen4/Gen5 x4.
- The MCIO x8 carries up to 128 GT/s aggregate (Gen5).
Q2: Can I use it with Gen3/Gen4 devices?
Yes, the cable is backward-compatible. Performance will match the lowest common generation between host and device.
Q3: What’s the difference between MCIO and Oculink?
- MCIO: Primarily a board-to-cable interface for dense server I/O.
- Oculink: A compact external interface designed for PCIe/NVMe drive connectivity.
This cable bridges them.
Q4: Why choose 1 meter?
- PCIe Gen5 signals degrade quickly over long runs.
- 1 meter is often the maximum reliable length for Gen5, balancing reach and signal integrity.
Q5: Can I connect GPUs with this?
Yes, provided the GPU or accelerator has an Oculink interface and the host MCIO port maps PCIe lanes directly.
Q6: Is it suitable for U.2/U.3 drives?
Indirectly. With an Oculink-to-U.2 adapter/backplane, you can connect U.2/U.3 drives through this cable.
Conclusion
The MCIO x8 74P to 2X Oculink 4i Cable – 1 Meter is a high-speed interconnect solution enabling PCIe Gen5 scalability in dense server environments. Whether expanding NVMe storage, linking accelerators, or deploying edge/HPC systems, this cable provides the reliability, bandwidth, and compactness modern IT infrastructure demands.
Part # MCIO-2040-OCU