Exablaze is now part of Cisco.

End-of-life Notice

The ExaNIC X4 product has reached end-of-life status. The product is no longer manufactured or supported. Please consider using alternative products.

If you require an ultra-low latency NIC, please consider the ExaNIC X25. If you require a low-latency NIC with high connectivity density, please consider the ExaNIC X40 .

This page is kept for archival interest only.



Exablaze's ExaNIC is an ultra low latency network interface card. Typical latency is under a microsecond application to application for small Ethernet frames (using the native API) and approximately 1.1 microseconds for small TCP and UDP payloads (using the transparent socket acceleration library).

The ExaNIC X4 also has built in port mirroring and bridging functionality, both useful features that are not available in other NICs. Additionally, with hardware-based time stamping of every packet to 6.2 nanoseconds resolution, users can rethink their approach to measurement and latency management.


  • Timestamp resolution:
    • - 6.2ns
  • Timestamp availability:
    • - All received (RX) frames
    • - Most recent transmitted (TX) frame
  • Time synchronization:
    • - Host clock synchronization
    • - PTP (IEEE1588) (+/-10ns)
    • - PPS in/out
  • Time synchronization software:
    • - Linux PTP (PTP4L)
    • - PTPD (hardware timestamp branch)
    • - exanic-clock-sync
    • - Solarflare PTPD (SFPTP)


  • Port mirroring:
    • - Ports 1-3 transmit/receive individually selectable for mirroring to port 4
  • Port bridging:
    • - Optional forwarding between ports 1 and 2, latency <170ns
  • Flow steering and flow hashing:
    • - 128 IP rules per port
    • - 64 MAC rules per port
  • High rate packet capture:
    • - Using free and open source Exact Capture software
    • - Best paired with ExaDISK high rate capture NVMe drives
  • Backup power input:
    • - 12V DC
  • FPGA Customization:


  • Form factor:
    • - Full-height, half-length PCI Express card
  • Host Interface:
    • - PCIe Gen 2 x8 @ 5.0 GT/s per lane
  • Ports:
    • - 4x SFP+
  • Data rates / Supported Media:
    • - 10 Gigabit Ethernet, 1 Gigabit Ethernet, 100M Ethernet
    • - Fiber (10GBASE-SR, 10GBASE-LR, 1000BASE-SX, 1000BASE-LX), Copper (1000BASE-T)
    • - SFP+ Direct Attach
    • - For best compatibility and performance, use genuine optical modules and cables from Exablaze.
  • Operating systems:
    • - Linux (any distribution)


  • Purchase includes 1 year support and warranty, extended options available:


The product brochure for more information