MXH914 PCIe 4.0 NTB Host Adapter

PCI Express Gen 4.0 x4 NTB Host Adapter

The MXH914 Gen4 PCI Express NTB Host Adapter is our entry point for PCIe 4.0 NTB clustering. Based on Microchip Switchtec Gen4 PCI Express bridging architecture, the MXH914 host adapter includes advanced features for non-transparent bridging (NTB), DMA operations and clock isolation. The adapter card supports the full Dolphin eXpressWare software stack.

  • PCIe 4.0 x8 edge connector
  • PCIe 4.0 x4 cable
  • 0.5 microsecond host to host latency
  • Low Profile Design
  • One x4 SFF-8644 Cable port
  • Non Transparent Bridging
  • 64 GT/s Performance
  • Full Dolphin Software Stack
Scale out PCI Express with the MXS924

MXH914 Product Data

The MXH914 is our entry level PCIe 4.0 NTB adapter. It supports a single x4 PCIe connection and utilizes the Microchip Switchtec® Gen4 PCIe switch for host to host communication. The adapter is used for both clustering and hot add application and is ideal for connecting smaller systems that don't need the full PCIe 4.0 x16 bandwidth.

For application developers, the MXH914 host adapter combines 64 GT/s performance with an application to application latency below 500 nanoseconds. It includes support for our eXpressWare software.

Dolphin eXpressWare Software

The MXH914 card comes with a full license to the Dolphin eXpressWare clustering software. eXpressWare includes the following:

  • 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 eXpressWare software suite takes advantage of DMA and PIO data transfer schemes to effectively move both large and small data sets. PIO transfers optimize small packet movement at the lowest latency. DMA operations  transfers data with virtually no CPU consumption. The eXpressWare software suite for the the MXH914 is currently available for Linux and Windows.

To learn more about our eXpressWare software click here for more information: Dolphin eXpressWare clustering software.


The MXH914 card includes a single SFF-8644 cable connector for PCIe 4.0 cables. The MXH914 is optimized for maximum cable lengths. Fiber optics extends this distance to 100 meters. More info on cable alternatives for the MXH914 card.


The MXH914 can be used in two types of PCIe networks:

  • A two node network connecting MXH914 systems in a back-to-back configuration. Each node will connect with a full PCIe Gen 4.0 x4 link between them.
  • The MXH914 can be connected to a MXS924 24 port PCIe Gen4 switch to scale out to larger networks.


  • PCI Express® 4.0 compliant - 16.0 GT/s per lane
  • Four lane PCIe Gen 4.0 link
  • Link compliant with Gen1, Gen2, Gen3 PCI Express
  • PCI Express 4.0 cables
  • Single SFF-8644 x4 Gen 4.0 PCI Express NTB cable port
  • RDMA support through DMA, PIO and System DMA
  • Copper and fiber-optic cable connector
  • 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
  • Link status LED through face plate

Dolphin PCIe 4.0 NTB Host Adapter comparison

The table below compares the PCIe 4.0 NTB host adapters available from Dolphin.

Adapter PCIe Edge connector PCIe Cable port
MXH930 x16 Quad x4 SFF-8644
MXH918 x8 Dual x4 SFF-8644
MXH916 x8 Quad x4 SFF-8644
MXH914 x8 Single x4 SFF-8644
Feature Description
Max Slot Speed PCIe 4.0 x8
Max Link Speed PCIe 4.0 x4
Application Performance Less than 500 nanosecond latency (application to application)
Active Components Microchip Switchtec® Gen4 PFX PCIe Switch
PCI Express®

Base Specification 4.0
Card Electromechanical Specification 4.0
External Cabling Specification Spec 4.0


2 node direct cable
Switch topologies using MXS924

Cable Port Single SFF-8644 / One x4 PCIe 4.0 Port
Supported cables

PCIe 4.0 cable
PCIe 4.0 fiber optic cable

Maximum power rating

12 Volt: max 1.49A (no port power) - 1.62A (max port power)
+3.3 Volt: Not connected
+3.3 Volt Aux: 0.03A

Typical power rating

12 Volt: 1.0A (no port power)
+3.3 Volt: Not connected
+3.3 Volt Aux: 0.01A

Port power supply

VPWR: 3.2V - 3.4V, 0.455A
VMGTPWR: 3.2V - 3.4V, 0.30mA

Mechanical Dimensions Low profile, Half length 116.2mm- (4.57 inches) x 6.90 mm (2.72 inches)
Operating Environment Operating Temperature: 0°C - 55°C (32°F - 131°F)
Airflow : 350 LFM (@max ambient temperature)
Relative Humidity: 5% - 95% (non- condensing)
Storage Environment Storage Temperature: -40°C - 70°C (-40°F - 158°F)
Relative Humidity 95% (non- condensing) at 35°C
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

Regulatory EMC tests

EN 55032:2012
EN 55035:2017
EN 61000-3-2:2014
EN 61000-3-3:2013
47 CFR Part 15, Subpart B (Clause 15.107 and 15.109) in conjunction with ANSI C63.4:2014
CISPR 35:2016 Edition 1.0 (CISPR/I/412/CDV) Korean Harmonized standard, KN 35

Operating Systems


MXH914 - NTB Host + Dolphin eXpressWare software license

MXH915 - Transparent Host

Now Hiring - Sales Manager, Software Developers, ASPICE Expert - Apply now !