Exablaze’s ExaNIC X40 is a high density network interface card featuring incredibly low latency: 800ns application to application for small Ethernet frames (using the native API) and under a microsecond for small TCP and UDP payloads (using the transparent socket acceleration library).


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Model Number

ExaNIC X40

Typical latency, raw frames

  • 60 bytes: 800ns
  • 300 bytes: 1.02μs

Typical latency, raw frames with preloaded TX buffer

  • 60 bytes: 730ns
  • 300 bytes: 950ns

Typical latency, UDP

  • 14 bytes: 900ns
  • 300 bytes: 1.22μs

Typical Latency, TCP

  • 14 bytes: 950ns
  • 300 bytes: 1.22μs

Form factor

Half-height PCI Express card


2 QSFP+, PPS in/out

Data rates

40 Gigabit Ethernet(**), 10 Gigabit Ethernet, 1 Gigabit Ethernet, 100M Ethernet

Supported Media

Fiber (40GBASE-SR4, 10GBASE-SR, 40GBASE-LR4, 10GBASE-LR), QSFP+ Direct Attach

Host Interface

PCIe x8 Gen 3.0 @ 8.0 GT/s per lane

Operating Systems

Linux (any distribution)

Timestamp resolution


Timestamp availability

all received frames, most recent transmitted frame

Time synchronization

Host, PTP, optional PPS

PPS input/output


Flow steering and flow hashing

128 IP rules per port, 64 MAC rules per port

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