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Green rectangular PCIe plug-in card with single SFP cage and gold edge connector

Axiom

Axiom 394793-B21-AX PCIe x4 1Gbps SFP Fiber Network Connector

SKU CH-YJ38-ZBN59 MPN 394793-B21-AX

PCI Express 2.1 x4 fiber adapter with one SFP port for 1000Base-SX networks

  • Adapter typeSFP
  • Product weight0.12
  • Single-port fiber uplink for 1000Base-SX networks
  • PCI Express 2.1 x4 host interface provides dedicated bandwidth
  • SFP transceiver slot accepts standard optical modules
  • Plug-in card form factor fits standard expansion slots
  • Tested for reliability in mission-critical applications

PCIe 2.1 x4 single-port fibre adapter

This Axiom 394793-B21-AX network connector adds one SFP fibre port to a server or workstation through a PCI Express 2.1 x4 slot. It is built for IT teams that need a dedicated 1000Base-SX link in an HP-branded environment. The plug-in card form factor fits standard expansion bays without requiring a proprietary chassis.

Sustained 1 Gbps optical throughput

The adapter maintains line-rate 1 Gbps traffic over optical fibre during continuous workloads rather than only in short bursts. Enterprise-class testing validates long-term reliability for high-transaction and mission-critical applications. Virtualisation optimisation helps consolidate I/O while protecting existing infrastructure investments.

PCIe 2.1 x4 bandwidth ceiling

The four-lane PCI Express 2.1 interface caps total bidirectional throughput at the electrical limit of that generation. A single SFP port cannot exceed the 1 Gbps media rate of 1000Base-SX regardless of slot headroom. Builders needing multiple fibre links or higher line speeds must select a different adapter.

How it compares

Measured against everything we stock in Network Adapters & RJ45 Plugs, at today’s prices. Recalculated every night.

Price $165.99
Pricier than about 90% of the 1,221 comparable items (median $19.99).

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Specifications

Product
Brand nameAxiom
Part number394793-B21-AX
Adapter typeSFP
Size & build
Shipping weight0.05 kg
Package size132 × 69 × 12 mm

Questions about this item

How much heat does the PCIe 2.1 x4 adapter add when it runs all day?

The card draws power through the PCI Express 2.1 x4 slot and has no active cooling, so it adds only a small amount of heat inside the server chassis.

What SFP transceiver do I need before this adapter will link up?

You must supply a 1000Base-SX SFP module; the adapter itself has an empty SFP cage and ships without a transceiver.

Will the card work in an older server that only has 32-bit PCI slots?

No, the adapter requires a PCI Express 2.1 x4 slot and is not compatible with legacy 32-bit PCI expansion slots.

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