• The World’s Lowest Latency 10/25G Ethernet NIC
  • The Industry’s 1st Standard NIC with Hardware Security

The X2522 dual-port 10/25G Ethernet NIC is a member of the X2 family of XtremeScale products that redefine the price/performance of standard NICs for modern data centers.

Designed from the ground up for virtualized dense server environments, Solarflare XtremeScale X2 adapters are the most cost-effective NICs in the industry for Ethernet connectivity. At the same time, XtremeScale acceleration provides record-breaking low latency and throughput needed for today’s modern class of applications. X2 is the most secure standard NIC with integrated hardware firewalls. XtremeScale X2 is the only general-purpose NIC with 2,048 Virtual NICs, programmable packet processing engine for network off-load and real-time packet/flow capture required by your network performance management and analytics platforms.


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Model Number

Solarflare XtremeScale X2522 Dual-Port 10GbE SFP28 Network Adapter

Features and Benefits

  • Acceleration Services Allow Distributed Apps to Scale-Out
  • Precision Time Stamping for Accurate Synchronization
  • Protect Traffic “Inside” the Data Center by Deploying the Industry’s 1st Standard NICs with HW Security On-Board
  • Real-Time Telemetry Feeds Security & Analytics
  • A Platform for Micro-Segmented NIC Fabric Services
  • The Most Cost Effective NICs in the Industry


  • MSI-X Support
  • 2x10/25G 64-byte line rate
  • Interrupt Coalescing

Universal Kernel Bypass

  • DPDK Poll Mode Driver: Packet (Cloud, Telco)
  • ScaleOut Onload: TCP (Cloud, Telco, Enterprise)
  • Onload*: TCP/UDP
  • TCP Direct*: TCP/UDP


  • ServerLockTM Local Hardware Filtering: Monitor, report, analyze, filter and enforce policies
  • Tamper resistant adapter: Digitally signed firmware and secured private keys

Time Synchronization and Hardware Timestamping

  • On-board Stratum 3 compliant oscillator
  • Solarflare Software PTP Daemon delivers enhanced stability and clock synchronization accuracy and can be used to synchronize the adapter clock to external time source

Stateless Offloads

  • TCP/UDP Checksum Offload (CSO)
  • TCP Segmentation Offload (TSO)
  • Generic Segmentation Offload (GSO)
  • Large Send Offload (LSO)
  • Large Receive Offload (LRO)
  • Receive Side Scaling (RSS)
  • Receive Segment Coalescing (RSC)

Manageability and Remote Boot

  • PXE and UEFI
  • Solarflare Secure Boot
  • Tamper resistant Secure Firmware Upgrade
  • NC-SI over MCTP SMBus
  • PLDM over MCTP SMBus

Management and Utilities

  • Ethtool Support
  • vCenter Plug-in
  • Solarflare Boot Manager

Adapter Hardware

  • PCIe Gen 3.1 x8
  • 25GSFP28 or 10GSFP+ direct attach copper oroptical transceiver; SFP28 cages

Hardware Certifications

  • FCC, UL, CE
  • RoHS - Complies with EU directive 2011/65/EU

Traffic Engineering

  • XtremePacket™ Engine for dedicated parsing, filtering, and flow steering
  • TCP/UDP/IP, MAC, VLAN, RSS filtering, Accelerated Receive Flow Steering (ARFS), Transmit Packet Steering


NVMeoF-TCP Plug-in for low latency, high performance storage networking on standard Ethernet fabric


  • Linux Multi-queue
  • VMware NetQueue
  • Microsoft Hyper-V Virtual Machine Queue (VMQ)
  • SR-IOV: 16 physical functions, 240 virtual functions
  • 2048 Guest OS protected vNICs
  • Full hardware switch fabric in silicon capable of steering any flow based on Layer 2 to Layer 4 protocols, between physical and virtual interfaces
  • VXLAN, NVGRE, and GENEVE tunneling of offloads; adaptable to custom overlays
  • VLAN and VLAN Q-in-Q Insertion/Stripping

Ethernet Standards

  • IEEE802.3-2012 Ethernet Base Standard, including 802.3bx
  • IEEE 802.3-2015 Ethernet Flow Control
  • IEEE 802.3ad, 802.1AX Link Aggregation
  • IEEE 802.1Q, 802.1P VLAN Tags and Priority
  • IEEE 1588-2008 PTPv2
  • Jumbo Frame support (9000 bytes)

OS Support

  • Red Hat RHEL, SUSE SLES, Debian, Ubuntu
  • Windows Server
  • VMware ESXi
  • For complete list of supported OS versions visit:

Physical Dimensions

  • L: 16.75 cm (6.6 in)
  • W: 6.9 cm (2.7 in)
  • End bracket height:PCI Express standard,12.0cm (4.725in)
  • PCI Express low-profile: 7.92 cm (3.12 in)

Environmental Requirements

  • Operating Temperature: 0°C to 55°C (32°F to 131°F)
  • Storage Temperature: –40°C to 65°C (–40°F to 149°F)
  • Operating (Humidity): 10% to 80%
  • Storage (Humidity): 5% to 90%

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