MXH930 PCIe NTB Host Adapter

PCI Express Gen 4 x16 NTB Host Adapter

The MXH930 Gen4 PCI Express NTB Host Adapter is our high performance PCIe clustering product. Based on Microsemi Switchtec Gen4 PCI Express bridging architecture, the MXH930 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 4.0 or MiniSAS-HD cables
  • <0.5 microsecond latency
  • Low Profile Design
  • Quad SFF-8644 Connectors
  • Non Transparent Bridging
  • 256 Gbit/s Performance
  • Full Dolphin Software Stack
Scale out PCI Express with the MXS824

Product Data

The MXH930 Gen4 PCI Express NTB Host Adapter is our high performance clustering product. Based on Microsemi Switchtec® Gen4 PCI Express bridging architecture, the MXH930 host adapter includes advanced features for non-transparent bridging (NTB) and clock isolation.

For high performance application developers, the MXH930 host adapter combines 256 Gbit/s performance with an application to application latency below 500 nanoseconds. Inter-processor communication benefits from the high throughput and low latency. Using the latest SmartIO technology software from Dolphin, GPU / Cuda applications can now stream data to remote GPUs at at the same speed as to local GPUs. Advanced DMA features enables fast data transfers hosts. .

Dolphin eXpressWare

The MXH930 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

Dolphin’s software suite takes advantage of DMA and PIO data transfer scheme to effectively supporting both large and small data transfers. PIO transfers optimize small packet transfers at the lowest latency. DMA moves data with virtually no CPU consumption. The eXpressWare software is currently available for Linux, Windows and VxWorks.

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


The MXH930 card has a quad SFF-8644 cable connector and supports MiniSAS-HD / SAS-4 cables as well as the new PCIe 4.0 cables. The MXH930 is carefully designed for maximum cable lengths. Fiber optics extends this distance to 100 meters. More info on cable alternatives for the MXH930 card.


The MXH930 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 systems
  • Larger configurations can be realized with one or more of the MXS824 24 port Gen3 switch.(A Gen4 version of this switch is also being designed)

Transparent PCIe

If you don't need the Dolphin eXpressWare, please select the MXH932 Gen4 Adapter card.


  • PCI Express® 4.0 compliant - 16.0 Gbps per lane
  • Link compliant with Gen1, Gen2, Gen3 PCI Express
  • PCI Express 4.0 or MiniSAS-HD® cables
  • Quad SFF-8644 x4 Gen3\4 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 DMA, PIO and System DMA
  • Copper and fiber-optic cable connectors
  • 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

Availability: Evaluation boards availalbe now.


Feature Description
Link Speeds 64 Gbit/s per port, total 256 Gbit/s
Application Performance Less than 500 nanosecond latency (application to application)
Active Components Microsemi Switchtec® Gen4 PCI Express Switch
PCI Express®

Base Specification 4.0
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 Gen4 Ports
Supported cables

PCIe 4.0 cables
MiniSAS-HD copper cables
MiniSAS-HD fiber optic cable

Power Consumption

12 Volt : Max XX Watts
12 Volt : Max XX 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 : TBD
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
Pending Regulatory approvals CE Mark
FCC Class A
RoHS compliant
UL94V-0 compliant
Operating Systems Windows

MXH930 - NTB Host + Transparent Host + Target functionality Dolphin eXpressWare software license

MXH932 - Transparent Host + Target functionality only

Evaluation boards available. Please contact Dolphin for more information.

  • MXH930 Product Brief (coming)
  • MXH930 Users Guide (coming)