Cisco Nexus Exanic X40 SmartNIC K35-Q Dual-Port 40GbE QSFP+ PCIe 3.0 x8 FPGA NIC NXN-K35-8X with Low Profile SFF Mounting Bracket

Manufacturer: Exablaze
OEM / Cisco Branded: Cisco Nexus SmartNIC K35-Q

Model: ExaNIC X40
Part Number: NXN-K35-8X (Cisco)
OEM Part Number: ExaNIC X40

Key Specifications:
Ports: Dual QSFP+ (2x 40GbE or 8x 10GbE via breakout cables)
Interface: PCIe 3.0 x8 @ 8.0 GT/s
Form Factor: Low Profile / Half-Height PCIe Card (150 x 68 mm)
Bracket: Low Profile SFF only
Transceivers / Cables: Not Included
Firmware: Latest Cisco SmartNIC K35-Q (x40_20211125)

This is a genuine Exablaze ExaNIC X40 ultra-low latency FPGA-accelerated network interface card flashed with the latest Cisco SmartNIC K35-Q firmware. The physical card retains all original Exablaze / ExaNIC X40 markings. It is engineered for the most demanding low-latency applications such as high-frequency trading (HFT), market data processing, packet capture, and HPC environments.

Manufacturer's Description:

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).

The ExaNIC X40 ships with firmware providing eight 10GbE interfaces on a host, and through the use of QSFP+ breakout cables can connect to eight SFP+ ports. This enables a range of high performance applications such as packet capture across multiple connections, or market data line arbitration across many different feeds.

An alternate firmware image is available for download that provides two 40GbE interfaces. Users are free to switch between firmware images depending on their requirements.

As with our other NICs, the ExaNIC X40 provides hardware-based time stamping to a resolution of 6.2 nanoseconds. The card features an SMA connector which can accept a pulse-per-second (PPS) in or drive PPS out to further improve the accuracy of timestamps taken throughout the system.

Performance:

• Raw frames: 60 bytes: 800ns | 300 bytes: 1s
• Raw frames (pre-loaded TX buffer): 60 bytes: 730ns | 300 bytes: 950ns
• UDP (ExaSOCK acceleration): 14 bytes: 880ns | 300 bytes: 1.2s
• TCP (ExaSOCK acceleration): 14 bytes: 930ns | 300 bytes: 1.2s

Timestamping:

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

Other Features:

• Flow steering and flow hashing: 128 IP rules + 64 MAC rules per port
• High rate packet capture using free Exact Capture software
• FPGA Customization: JTAG header + Low-latency optimized Firmware Development Kit

Condition: Clean working pull from enterprise equipment. Fully tested and guaranteed 100% working.

What's Included:
Exablaze ExaNIC X40 Dual-Port 40GbE Card (flashed with latest Cisco SmartNIC K35-Q firmware)
Low Profile / SFF mounting bracket

Note: No transceivers, cables, software, or drivers are included. You will receive the exact card shown in the listing photos.

30-Day Warranty Included!

Perfect for high-frequency trading (HFT), market data feeds, low-latency financial systems, packet capture & analysis, HPC clusters, and any advanced networking application requiring maximum performance and precision timing.