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Green PCB adapter card with silver PCIe x16 edge connector and two black OCuLink ports

SMUGDESK

SMUGDESK PCIe 4.0 x8 to Dual OCuLink SFF-8611 SFF-8612 Adapter

SKU CH-2V8N-DWHW6

Splits one PCIe 4.0 x8 slot into two x4 OCuLink ports (SFF-8611 host, SFF-8612 device) for dual U.2 NVMe SSDs or eGPU docks with VROC RAID0 support

  • PCIe 4.0 x8 bifurcation delivers two x4 OCuLink ports with up to 128Gbps total bandwidth
  • Dual SFF-8611 and SFF-8612 connectors enable U.2 NVMe SSD and eGPU dock connections
  • Intel VROC RAID0 support combines two U.2 SSDs for high-speed storage arrays
  • Detachable PCIe header plus built-in signal re-driver ensures stable long-cable transmission
  • Works in PCIe 4.0, 3.0, 2.0 x8 or x16 slots on Windows and Linux

PCIe 4.0 x8 bifurcation adapter

This SMUGDESK adapter converts a single PCIe 4.0 x8 motherboard slot into two independent x4 OCuLink ports. It targets builders who need to attach two U.2 NVMe SSDs or connect an external graphics dock from one expansion slot. The board includes a detachable PCIe header for flexible routing inside tight chassis. It does not serve buyers who want more storage devices than two ports allow.

Splits one x8 lane into two x4 OCuLink ports

The key specification is PCIe 4.0 x8 bifurcation, dividing the lane into two x4 links with total bandwidth up to 128Gbps. Each port uses SFF-8611 host and SFF-8612 device connectors for direct U.2 NVMe SSD or eGPU attachment. Motherboard BIOS must support bifurcation; without it the adapter cannot present two separate endpoints.

Signal re-driver keeps links stable over long cables

A built-in signal re-driver maintains clean 4.0 signalling across extended OCuLink cables, preventing errors during sustained RAID0 or compute workloads. The adapter remains compatible with 3.0 and 2.0 slots, though bandwidth scales to the slot generation. Windows and Linux both recognise the bifurcated ports without extra drivers.

How it compares

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

Price $29.99
Pricier than about 72% of the 354 comparable items (median $21.99).

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Specifications

No published specifications for this item yet.

Questions about this item

What does the 128 Gbps total bandwidth mean for my U.2 SSDs?

The adapter splits one PCIe 4.0 x8 slot into two x4 OCuLink ports, so two U.2 NVMe drives share the full 128 Gbps aggregate throughput for VROC RAID0 or independent workloads.

Which OCuLink connectors are on the board and what speeds do they support?

It provides one SFF-8611 host port and one SFF-8612 device port, each running at PCIe 4.0 x4 and backward-compatible with 3.0 and 2.0.

What slot and clearance do I need to install this card?

The detachable bracket fits a standard PCIe x8 or x16 slot and requires only the slot space; cables plug into the SFF-8611 and SFF-8612 ports on the bracket.

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