MXH830 PCIe NTB Host Adapter  

PCI Express Gen 3 x16 NTB Host Adapter

Not recommended for new designs - New designs should use MXH930 or MXH940.

The MXH830 Gen3 PCI Express NTB Host Adapter is based on Microchip Switchtec Gen3 PCI Express bridging architecture. The MXH830 host adapter includes advanced features for non-transparent bridging (NTB) and clock isolation. The adapter card supports the full Dolphin eXpressWare software stack.

  • One x16 PCIe edge port
  • Four x4 PCIe Cable ports
  • PCIe 3.0 or MiniSAS-HD cables
  • 0.64 microsecond latency
  • Low Profile Design
  • Quad SFF-8644 Connectors
  • Non Transparent Bridging
  • 128 Gbit/s Performance
  • Full Dolphin Software Stack
Scale out PCI Express with the MXS824

Product Data

The MXH830 Gen3 PCI Express NTB Host Adapter is based on Microchip Switchtec® Gen3 PCI Express bridging architecture. The MXH830 host adapter includes advanced features for non-transparent bridging (NTB) and clock isolation.

For high performance application, the MXH930, MXH940 or MXH950 host adapter is recommended.

Dolphin eXpressWare

The MXH830 card comes with a full license to the Dolphin eXpressWare clustering software. This includes

  • SISCI API - a robust and powerful shared memory programming environment for PCIe
  • Standard TCP/IP drivers
  • SuperSockets socket accelerator software
  • SmartIO - access to remote PCIe devices over PCIe
  • Board management software

The MXH830 does not have an on chip PCIe DMA engine, but Dolphin’s software suite takes advantage of System DMA (RDMA) and CPU PIO data transfer scheme to effectively supporting both large and small data packets. PIO transfers optimize small packet transfers at the lowest latency. The eXpressWare software is currently available for Linux, Windows.

The overall software framework is designed for rapid development and deployment of inter-processor communication systems. More information about Dolphin eXpressWare clustering software.


The MXH830 card has a quad SFF-8644 cable connector and supports MiniSAS-HD cables as well as the new PCIe 3.0 cables. The MXH830 is carefully designed for maximum cable lengths. More info on cabls for the MXH830 card.


The MXH830 can be used to create several types of PCIe networks:

  • A two node network can be realized using 4 cables (x16). Full x16 performance between the two systems.
  • A three node network can be realized using 2 cables (x8) between each system. Full x8 performance between the three systems.
  • A five node network can be realized using 1 cable (x4) between each system. Full x4 performance between the five sysgems
  • Larger configurations can be realized with one or more of the MXS824 24 port Gen3 switch.

Transparent PCIe

The MXH830 firmware also supports transparent operations. If you don't need the Dolphin eXpressWare, please select the MXH832 Gen3 Adapter card.


  • PCI Express® 3.1 compliant - 8.0 Gbps per lane
  • Link compliant with Gen1 and Gen2 PCI Express
  • PCI Express 3.0 or MiniSAS-HD® cables
  • Quad SFF-8644 x4 Gen3 PCI Express NTB cable ports that can be configured as:
    • One - x16 PCI Express port
    • Two - x8 PCI Express ports
    • Four - x4 PCI Express ports
  • RDMA support through PIO and System DMA
  • Full host Clock isolation support. Automatic support for host running CFC or SSC
  • Non-transparent bridging to cabled PCI Express systems
  • Low profile PCI Express form factor
  • EEPROM for custom system configuration
  • Link status LEDs through face plate


Feature Description
Link Speeds 32 Gbit/s per port, total 128 Gbit/s
Application Performance 0.5 microsecond latency (application to application)
Active Components Microchip Switchtec® Gen3 PCI Express Switch
PCI Express®

Base Specification 3.1
Card Electromechanical Specificaiton 3.0
External Cabling Specification Spec 3.0


2 node direct cable
3 - 5 node mesh topology
Switch topologies using MXS824

Cable Port Quad SFF-8644 / Four x4 Gen3 Ports
Supported cables

PCIe 3.0 cables
MiniSAS-HD copper cables
MiniSAS-HD fiber optic cable (limited performance)

Power Consumption

12 Volt : Max 19.6 Watts
12 Volt : Max 24 Watts including AOC
+3.3 Volt: Not connected
+3.3 Volt AUX: Max 1 Watt

Mechanical Dimensions Low profile, Half length 168.2mm- (6.6 inches) x 69.2 mm (2.7 inches)
Operating Environment Operating Temperature: 0°C - 50°C (32°F - 122°F)
Air Flow : 150 LFM
Relative Humidity: 5% - 95% (non- condensing)
Software SuperSockets™ Berkley Sockets API
Microsoft WinSock2/LSP support
TCP/IP driver
Multicast groups Max 16, default 4
Configuration DIP-Switch
Regulatory approvals CE Mark
FCC Class A
RoHS compliant
UL94V-0 compliant
Operating Systems Windows

MXH830 - NTB Host + Transparent Host + Target functionality Dolphin eXpressWare software license

MXH832 - Transparent Host + Target functionality only

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