MXH917 PCIe 4.0 Transparent Host Adapter

MXH917 PCIe 4.0 Transparent Host Adapter

The MXH917 PCIe 4.0 x16 Transparent Host Adapter is our medium performance PCIe IO product. The card is based on the Microchip Switchtec PCIe 4.0 PFX Switch.

  • One x8 PCIe edge port
  • Four x4 PCIe Cable ports
  • PCIe 4.0 SFF-8644 cables
  • Copper and Fiber cable support
  • Quad SFF-8644 Connectors
  • Host Transparent Bridging
  • Low Profile Design
  • Optional board management software

Product Data

The MXH917 PCIe 4.0 Host Adapter is our medium performance transparent solution for connecting servers to external I/O subsystems. Based on Microchip® PCIe 4.0 bridging architecture, the MXH917 adapter enables reliable transparent PCIe cable connections and clock isolation. The MXH917 has a PCIe 4.0 x8 Edge connector and four PCIe Gen 4.0 x4 SSF-8644 connectors and is typically recommended for fan-out where sustained PCIe 4.0 x16 performance is not needed.

For high performance application, such as GPU farms, test and measurement equipment, medical equipment, and storage subsystem we recommend the MXH932 card.


The card does not supports the new PCI-SIG CMI (Cable Management Interface ) protocol as defined in the current PCI-SIG External Cable specification 3.0 but uses a proprietary mechanism to transmit reset. Please contact Dolphin for more information on compatibility for PCIe target devices. If you need a transparent card with Host and Target functionality supporting the CMI protocol, please select the MXH932.


The MXH917 card has a quad SFF-8644 cable connector and supports PCIe 4.0 SFF-8644 copper and fiber cables. Using the MXH917 as a Host card, standard PCIe cables enables basic transparent Host operations including propagation of host reset signal to the downstream device.

The MXH917 is carefully designed for maximum cable lengths. Fiber optics extends this distance to 100 meters. More info on cable alternatives for the MXH917 card.


The MXH917 uses an on-board DIP-Switch to select operational parameters. The adapter cable port can be configured as four x4, two x8 or one x16 PCIe connection. The card does not support being used as a Transparent Target card. Please select the MXH932 if you need a card supporting Transparent Target operation.

eXpressWare Board Management Software

The MXH917 Adapter card comes with the optional eXpressWare Board Management software for simplified monitoring and management. For more information on Dolphin board management software visit here.

PCI Express NTB

The MXH917 card is a transparent Host product only. To utilize the Dolphin's PCIe NTB eXpressWare clustering software, you need to purchase the MXH930 PCIe 4.0 NTB adapter card.


  • PCI Express® 4.0 compliant - 16.0 GT/s per lane
  • Link compliant with Gen1, Gen2, Gen3 and   Gen4 PCI Express
  • PCIe 4.0 x8 Edge connector
  • PCIe 4.0 cables
  • Quad x4 SFF-8644 PCI Express 4.0 cable ports that can be configured as:
    • One - x16 PCI Express port
    • Two - x8 PCI Express ports
    • Four - x4 PCI Express ports
  • Supports both copper and fiber-optic cables
  • Host clock isolation support
  • Low profile PCI Express form factor
  • Flash for safe system configuration
  • Link status LEDs through face plate

Dolphin PCIe 4.0 Transparent Adapter comparison

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

Adapter PCIe 4.0 Edge PCIe 4.0 Cable port Host/Target CMI
MXH932 x16 Quad x4 SFF-8644 Host/Target Yes
MXH919 x8 Dual x4 SFF-8644 Host No
MXH917 x8 Quad x4 SFF-8644 Host No
MXH915 x8 Single x4 SFF-8644 Host No


Feature Description
Link Speeds 64 Gbit/s per port, total 128 Gbit/s
Cut through latency 100 nanoseconds
Active Components Microchip Switchtec® Gen4 PCI Express Switch
PCI Express® Base Specification4.0

One x16 connection
Two x8 connections
Four x4 connections

Switch topologies using MXS924

Cable Port Quad SFF-8644 / Four x4 Gen4 Ports
Supported cables

PCIe 4.0 cables
PCIe 4.0 fiber optic cable

Maximum power rating 12 Volt: max 1.66A (no port power) 2.86A (max port power)
+3.3 Volt: Not connected
+3.3 Volt Aux: max 100mA
Typical power rating 12 Volt: 1.5 A (no port power)
+3.3 Volt: Not connected
+3.3 Volt Aux: max 100mA
PCIe Bracket Full height plate mounted
Half height plate included
Mechanical Dimensions Low profile, Half length 167.65mm- (6.6 inches) x 68.90 mm (2.731 inches)
Operating Environment Operating Temperature: 0°C - 55°C (32°F - 131°F)
Airflow : 350 LFM (Preliminary)
Relative Humidity: 5% - 95% (non- condensing)
Software No software needed
Configuration DIP-Switch
Host x4, x8, x16 Link
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 Basic operations - All

MXH917 - Transparent Host functionality only

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