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Green circuit board with gold PCIe x16 edge connector and two silver MCIO 8i ports, plus a 50cm ribbon cable attached

SMUGDESK

SMUGDESK PCIe 5.0 x16 to Dual MCIO 8i Splitter Card Full-Speed Base 50cm MCIO Cable eGPU

SKU CH-38YS-FQNFW

Splits a PCIe 5.0 x16 slot into two MCIO 8i x8 ports with a 50cm cable for eGPU and NVMe expansion

  • Splits one PCIe 5.0 x16 slot into two MCIO 8i x8 ports
  • Full-speed base preserves complete PCIe lane bandwidth without performance loss
  • 50cm MCIO cable enables flexible long-distance external wiring layout
  • Designed for eGPU expansion and high-capacity NVMe storage on workstations
  • Rigorous PCB layout ensures stable continuous operation under Windows and Linux

PCIe 5.0 x16 Splitter Card

This adapter divides a single PCIe 5.0 x16 slot into two MCIO 8i x8 ports while remaining compatible with 4.0 and 3.0 devices. A full-speed base design maintains complete lane bandwidth so no throughput is sacrificed. The included 50cm MCIO cable supports extended external routing for eGPU or storage deployments. It targets workstation and server builders who need high-speed expansion from one slot.

For Multi-Device Expansion Builders

Suits engineers adding an external GPU and an NVMe array simultaneously from one x16 connection. The dual-port layout enables parallel data paths without sharing bandwidth between devices. Not for users who only require a single MCIO link or who lack a free x16 slot on the motherboard. Also unsuitable for systems limited to PCIe 2.0 signalling.

Full-Speed Base Preserves Bandwidth

The full-speed base architecture keeps every lane at its native rate so the splitter introduces no bottleneck. This single specification determines whether the card can sustain peak throughput for demanding eGPU and storage workloads.

How it compares

Measured against everything we stock in Interface & Card Adapters, at today’s prices. Recalculated every night.

Price $39.99
Pricier than about 83% of the 354 comparable items (median $21.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Should I pick the PCIe 5.0 x16 version or an older generation for my eGPU build?

This card only exists as a PCIe 5.0 x16 splitter; it is backward compatible with 4.0 and 3.0 slots, so no other version choice is needed.

What does the x16 to dual x8 split mean for my external GPU bandwidth?

The single x16 slot divides into two independent x8 MCIO 8i links, giving each port full PCIe 5.0 x8 bandwidth without lane sharing.

How does the MCIO 8i interface limit real-world transfer speed?

Each MCIO 8i port runs at PCIe 5.0 x8 electrical, so the practical ceiling is the x8 lane bandwidth rather than the full x16 slot width.

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