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Green circuit board with four vertical OCuLink SFF-8612 ports and full-length PCIe x16 edge connector

RIITOP

RIITOP PCIe 4.0 x16 to 4-Port OCuLink SFF-8612 Adapter

SKU CH-3WD2-EGSWC

Adds four OCuLink SFF-8612 ports through a PCIe 4.0 x16 slot that supports x4x4x4x4 bifurcation for up to 256 Gbps total bandwidth

  • TypePCI Express Controller Card
  • External USB PortsNo

Model 4 Ports

  • Adds four OCuLink SFF-8612 ports from one PCIe 4.0 x16 slot
  • Delivers up to 256 Gbps aggregate bandwidth across four x4 links
  • Works with Windows, Windows Server and Linux without extra drivers
  • Requires motherboard BIOS support for x4x4x4x4 bifurcation
  • Backwards compatible with PCIe 3.0 and 2.0 slots at reduced speed

Four OCuLink ports on one slot

This PCIe 4.0 x16 adapter adds four SFF-8612 OCuLink connectors to a single expansion slot. It targets builders who need to connect multiple external GPU docks or NVMe enclosures without occupying extra motherboard lanes. The card requires a platform that can bifurcate the x16 link into four x4 links.

Sustained 256 Gbps across four links

Each port delivers up to 64 Gbps under the Gen4 standard, giving an aggregate 256 Gbps when all four are active. The adapter maintains these rates continuously because it uses a direct lane split with no switching overhead. Performance drops proportionally if the host slot operates at Gen3 or Gen2 speeds.

Bifurcation-dependent mounting

The board installs in any x16 slot but only functions when the firmware exposes an x4x4x4x4 bifurcation option. No drivers are needed for Windows, Windows Server or Linux. Cables are not included, so SFF-8612 leads must be sourced separately for each device.

Highlights

  • Adds four OCuLink SFF-8612 ports from one PCIe 4.0 x16 slot
  • Delivers up to 256 Gbps aggregate bandwidth across four x4 links
  • Works with Windows, Windows Server and Linux without extra drivers
  • Requires motherboard BIOS support for x4x4x4x4 bifurcation
  • Backwards compatible with PCIe 3.0 and 2.0 slots at reduced speed

Specifications

TypePCI Express Controller Card
External USB PortsNo

Other versions of this model

1 more in the same range

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Questions about this item

Does the adapter generate noticeable heat or fan noise when all four ports run at 64Gbps for long periods?

The card has no active cooling; it relies on case airflow and the motherboard slot power delivery, which is rated for the full 256Gbps aggregate bandwidth.

What motherboard feature must be present and enabled in BIOS before the card will function?

The board must support PCIe x16 bifurcation and be set to x4x4x4x4 mode, plus provide a free PCIe 4.0 or 3.0 x16 slot.

Can I keep my existing PCIe 3.0 NVMe drives and GPUs while adding this adapter?

Yes, the adapter is backwards compatible with PCIe 3.0 and 2.0 slots, though each port will operate at the lower generation speed.

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