We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Adafruit Oculink SFF-8611 8x to dual SFF-8639 U.2 cable, 50cm

Adafruit

Adafruit Oculink SFF-8611 8x to Dual SFF-8639 U.2 Cable 50cm

SKU CH-0AC3-8RYCS

Connects an Oculink 8611 8x port to two U.2 8639 drives at up to 64 Gbps over PCIe 4.0, 50 cm long

  • Connect backplanes to Oculink controllers using SFF-8611 8x to dual SFF-8639 U.2 connectors
  • Achieve PCIe 4.0 speeds up to 64Gbps with backward compatibility to PCIe 3.0
  • Split one 8-lane Oculink port into two 4-lane U.2 connections for multiple drives
  • Secure installation in compact hosts with integrated fixing holes on the cable assembly
  • Requires motherboard with bifurcation support to access all four drives simultaneously

Oculink SFF-8611 8x to Dual U.2 Cable

This 50cm active cable splits one Oculink SFF-8611 8x 80pin male connector into two SFF-8639 U.2 male connectors. It carries PCI Express 4.0 signals at up to 64Gbps and remains backward compatible with PCIe 3.0. The design targets small hosts, desktops and laptops that need to convert PCIe sockets to Oculink 8x sockets. Fixing holes allow secure mounting inside the chassis.

Bifurcation and Active Signal Conditioning

The cable functions only on motherboards that provide detachable PCI-E channels with bifurcation support; without lane splitting the board will recognise only a single drive. Active circuitry conditions the 4.0 signal across the split, enabling two U.2 devices to operate simultaneously from the single 8x upstream link. An optional cable can also attach one SSD or eGPU graphics card to the same assembly.

Builders with Bifurcation-Capable Boards

Suits system integrators who have a motherboard capable of PCIe lane bifurcation and need to attach two U.2 SSDs or a mix of SSD and expansion card through one Oculink port. Not suitable for platforms lacking detachable PCI-E channels or bifurcation support in firmware, as the second drive will remain invisible. Buyers needing longer reach or different connector orientations should look elsewhere.

Highlights

  • Connect backplanes to Oculink controllers using SFF-8611 8x to dual SFF-8639 U.2 connectors
  • Achieve PCIe 4.0 speeds up to 64Gbps with backward compatibility to PCIe 3.0
  • Split one 8-lane Oculink port into two 4-lane U.2 connections for multiple drives
  • Secure installation in compact hosts with integrated fixing holes on the cable assembly
  • Requires motherboard with bifurcation support to access all four drives simultaneously

Specifications

No published specifications for this item yet.

Questions about this item

Will the Oculink SFF-8611 8x connectors need replacement after repeated mating cycles?

The cable uses fixed SFF-8611 8x 80pin male and dual SFF-8639 U.2 male connectors rated for standard PCIe insertion cycles; no scheduled replacement is required unless physical damage occurs.

What limits sustained throughput on the 50cm link?

The cable carries PCIe 4.0 at up to 64Gbps; the practical ceiling is the host controller's 8-lane budget and any thermal throttling of the attached SSD or GPU.

Does the active 50cm cable add noticeable heat or fan noise during all-day transfers?

The cable itself is passive copper with no active electronics, so it adds negligible heat and zero acoustic noise; system thermals depend only on the connected drives or GPU.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.