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Green circuit board with silver bracket and two SFP+ cages

Solarflare Communications, Inc.

Solarflare Communications, Inc. SFN5122F dual-port 10GbE SFP+ network card

SKU CH-JSFA-S6CDZ MPN SFN5122F

Dual-port 10GbE SFP+ server adapter with PCIe x8, 254 virtual functions, 2048 protected vNICs and sub-5 W power draw

  • StandardsIEEE 802.3ae IEEE 802.3ad IEEE 802.1Q IEEE 802.1p IEEE 802.3
  • Speed10Gbps
  • Connectors2 x SFP+
  • InterfacePCI-Express x8
  • FeaturesI/O Virtualization: 2048 guest OS protected vNICs; 254 Virtu
  • DimensionsL: 16.74 cm (6.59 in) W: 6.89 cm (2.71 in)
  • Dual-port 10GbE SFP+ connectivity for high-speed server networking
  • PCI-Express x8 interface provides full 40Gbps bidirectional line-rate performance
  • Low-latency cut-through architecture with intelligent interrupt coalescing for responsive workloads
  • Supports up to 254 virtual functions and 2048 protected vNICs for dense virtualization
  • Low power consumption under 5 Watts reduces data-center operating costs

Dual-port 10GbE SFP+ server adapter

The Solarflare SFN5122F is a dual-port 10GbE SFP+ network card built for enterprise servers. It connects through a PCI-Express x8 slot and supports IEEE 802.3ae, 802.3ad, 802.1Q, 802.1p and 802.3x standards. The adapter delivers full 40 Gbps bidirectional line-rate performance while drawing less than 5 Watts. It is designed for high-density deployments that need consistent low latency.

Virtualised and latency-sensitive workloads

This card suits environments that run many virtual machines or need predictable response times. It provides up to 2048 protected vNICs and 254 Virtual Functions with I/O virtualisation support. Receive Side Scaling distributes IPv4 and IPv6 traffic across processor cores. Buyers who need copper RJ45 connectors or a single-port design should consider other options.

PCI-Express x8 interface requirement

The adapter requires an available PCI-Express x8 slot in the host server. Physical size is 16.74 cm by 6.89 cm and weight is 0.45 lb. Two SFP+ cages accept compatible transceivers or direct-attach cables for 10Gbps links. Verify that the chassis can accommodate a full-height bracket and that the slot provides an x8 electrical connection.

Highlights

  • Dual-port 10GbE SFP+ connectivity for high-speed server networking
  • PCI-Express x8 interface provides full 40Gbps bidirectional line-rate performance
  • Low-latency cut-through architecture with intelligent interrupt coalescing for responsive workloads
  • Supports up to 254 virtual functions and 2048 protected vNICs for dense virtualization
  • Low power consumption under 5 Watts reduces data-center operating costs

Specifications

BrandSolarflare
ModelSFN5122F
StandardsIEEE 802.3ae
IEEE 802.3ad
IEEE 802.1Q
IEEE 802.1p
IEEE 802.3x
Speed10Gbps
Connectors2 x SFP+
InterfacePCI-Express x8
FeaturesI/O Virtualization: 2048 guest OS protected vNICs; 254 Virtual Functions
Low Latency: Cut-through architecture / intelligent interrupt coalescing
Receive Side Scaling (RSS): Distributes IPv4 / IPv6 loads across CPU cores; MSI-X minimizes interrupt overhead
Hardware Offloads: LSO, LRO, GSO; IPv4 / IPv6; TCP, UDP checksums
Adapter Teaming / Link Aggregation: LACP, MLAG for redundant links & increased bandwidth
Jumbo Frames: 9000 bytes MTU for performance
IP Flow Filtering: Hardware directs packets based on IP, TCP, UDP headers
Advanced Packet Filtering: 256 multicast filters; 4096 VLAN
DimensionsL: 16.74 cm (6.59 in)
W: 6.89 cm (2.71 in)
Weight0.45 lb.
Shipping weight0.10 kg
Package size191 × 146 × 30 mm

Questions about this item

What real-world throughput does the 40 Gbps bidirectional line-rate figure give me in a server?

The card can sustain full 10 Gbps on each SFP+ port simultaneously in both directions, so aggregate bidirectional traffic reaches 40 Gbps when both ports are fully loaded.

What does the PCI-Express x8 interface limit in practice?

The x8 slot provides enough bandwidth for dual-port 10 Gbps line-rate traffic; the bottleneck will be the SFP+ modules or cabling, not the host bus.

What are the exact dimensions I need to clear in a 1U chassis?

The board measures 16.74 cm long by 6.89 cm wide (6.59 in by 2.71 in) and weighs 0.45 lb, fitting standard low-profile brackets.

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