Hardware Installation

NVIDIA ConnectX-4 Lx Ethernet Adapter Cards User Manual

Installation and initialization of ConnectX-4 Lx adapter cards require attention to the mechanical attributes, power specifications, and precautions for electronic equipment.


Safety warnings are provided here in the English language. For safety warnings in other languages, refer to the Adapter Installation Safety Instructions.

Please observe all safety warnings to avoid injury and prevent damage to system components. Note that not all warnings are relevant to all models,

Note that not all warnings are relevant to all models.


General Installation Instructions

Read all installation instructions before connecting the equipment to the power source.


Jewelry Removal Warning

Before you install or remove equipment that is connected to power lines, remove jewelry such as bracelets, necklaces, rings, watches, and so on. Metal objects heat up when connected to power and ground and can meltdown, causing serious burns and/or welding the metal object to the terminals.



This equipment should not be operated in an area with an ambient temperature exceed­ing the maximum recommended: 55°C (131°F). An airflow of 200LFM at this maximum ambient temperature is required for HCA cards and NICs. To guarantee proper airflow, allow at least 8cm (3 inches) of clearance around the ventila­tion openings.


During Lightning - Electrical Hazard

During periods of lightning activity, do not work on the equipment or connect or dis­connect cables.


Copper Cable Connecting/Disconnecting

Some copper cables are heavy and not flexible, as such, they should be carefully attached to or detached from the connectors. Refer to the cable manufacturer for spe­cial warnings and instructions.


Equipment Installation

This equipment should be installed, replaced, or serviced only by trained and qualified personnel.


Equipment Disposal

The disposal of this equipment should be in accordance to all national laws and regula­tions.


Local and National Electrical Codes

This equipment should be installed in compliance with local and national electrical codes.


Hazardous Radiation Exposure

  • Caution – Use of controls or adjustment or performance of procedures other than those specified herein may result in hazardous radiation exposure.For products with optical ports.

  • CLASS 1 LASER PRODUCT and reference to the most recent laser standards:

    IEC 60 825-1:1993 + A1:1997 + A2:2001 and EN 60825-1:1994+A1:1996+ A2:20

The installation procedure of ConnectX-4 Lx adapter cards involves the following steps:



Direct Link


Check the system’s hardware and software requirements.

Refer to System Requirements


Pay attention to the airflow consideration within the host system.

Refer to Airflow Requirements


Unpack the product.

Refer to Unpacking the Product


(Optional) Replace the full-height mounting bracket with the supplied short bracket.

Refer to Bracket Replacement Instructions


Install the ConnectX-4 Lx adapter card in the system.

Refer to Installation Instructions


Connect cables or modules to the card.

Refer to Cables and Modules


Identify the ConnectX-4 Lx adapter card in the system.

Refer to Identifying the Card in Your System

Hardware Requirements


Unless otherwise specified, NVIDIA products are designed to work in an environmentally controlled data center with low levels of gaseous and dust (particulate) contamination.

The operation environment should meet severity level G1 as per ISA 71.04 for gaseous contamination and ISO 14644-1 class 8 for cleanliness level.

A system with a PCI Express x8 edge connector is required for installing the card.


For proper operation and performance, please make sure to use a PCIe slot with a corresponding bus width and that can supply sufficient power to your card. Refer to the Specifications section of the manual for more power requirements.

Airflow Requirements

ConnectX-4 Lx adapter cards are offered with two airflow patterns: from the heatsink to the network ports, and vice versa, as shown below.

Please refer to the Specifications chapter for airflow numbers for each specific card model.


All cards in the system should be planned with the same airflow direction.

Software Requirements


The adapter is being installed in a system that operates with voltages that can be lethal. Before opening the case of the system, observe the following precautions to avoid injury and prevent damage to system components.

  • Remove any metallic objects from your hands and wrists.

  • Make sure to use only insulated tools.

  • Verify that the system is powered off and is unplugged.

  • It is strongly recommended to use an ESD strap or other antistatic devices.

  1. Unpack the adapter package and place them on an antistatic surface, and verify you have received the following items:

    1. ConnectX-4 Lx Adapter Card, with a tall bracket assembled on the card.

    2. Short bracket (accessory)

  2. Check the parts for visible damage that may have occurred during shipping.


    Please note that if the card is removed hastily from the antistatic bag, the plastic ziplock may harm the EMI fingers on the networking connector. Carefully remove the card from the antistatic bag to avoid damaging the EMI fingers.



  3. Shut down your system if active:
    Turn off the power to the system, and disconnect the power cord. Refer to the system documentation for instructions. Before you install the ConnectX-4 Lx card, make sure that the system is disconnected from power.

The card is usually shipped with an assembled high-profile bracket. If this form factor is suitable for your requirements, you can skip the remainder of this section and move to Installation Instructions. If you need to replace the high-profile bracket with the short bracket that is included in the shipping box, please follow the instructions in this section.


Due to risk of damaging the EMI gasket, it is not recommended to replace the bracket more than three times.

To replace the bracket you will need the following parts:

  • The new brackets of the proper height

  • The 2 screws saved from the removal of the bracket

Removing the Existing Bracket

  1. Using a torque driver, remove the two screws holding the bracket in place.

  2. Separate the bracket from the ConnectX-4 Lx card.


    Be careful not to put stress on the LEDs on the adapter card.

  3. Save the two screws.

Installing the New Bracket

  1. Place the bracket onto the card until the screw holes line up.


    Do not force the bracket onto the adapter card.

  2. Screw on the bracket using the screws saved from the bracket removal procedure above.


    Use a torque driver to apply up to 2 lbs-in torque on the screws.

This section provides detailed instructions on how to install your adapter card in a system.


Please note that the following figures are for illustration purposes only.

  1. Before installing the card, make sure that the system is off and the power cord is not connected to the server. Please follow proper electrical grounding procedures.

  2. Open the system case.

  3. Place the adapter in an available PCI Express slot.


  4. Applying even pressure at both corners of the card, insert the adapter card into the PCI Express slot until firmly seated.


  5. When the adapter is properly seated, the port connectors are aligned with the slot opening, and the adapter faceplate is visible against the system chassis.


  6. Secure the adapter with the adapter clip or screw.


To uninstall the adapter card, see Uninstalling the Card.

Cable Installation

  1. All cables can be inserted or removed with the unit powered on.

  2. To insert a cable, press the connector into the port receptacle until the connector is firmly seated.

    1. Support the weight of the cable before connecting the cable to the adapter card. Do this by using a cable holder or tying the cable to the rack.

    2. Determine the correct orientation of the connector to the card before inserting the connector. Do not try and insert the connector upside down. This may damage the adapter card.

    3. Insert the connector into the adapter card. Be careful to insert the connector straight into the cage. Do not apply any torque, up or down, to the connector cage in the adapter card.

    4. Make sure that the connector locks in place.


      When installing cables make sure that the latches engage.


      Always install and remove cables by pushing or pulling the cable and connector in a straight line with the card.

  3. After inserting a cable into a port, the Green LED indicator will light when the physical connection is established (that is, when the unit is powered on and a cable is plugged into the port with the other end of the connector plugged into a functioning port). See LED Operations under the Interfaces section.

  4. After plugging in a cable, lock the connector using the latching mechanism particular to the cable vendor. When data is being transferred, the Green LED will blink. See LED Operations under the Interfaces section.

  5. Care should be taken as not to impede the air exhaust flow through the ventilation holes. Use cable lengths which allow for routing horizontally around to the side of the chassis before bending upward or downward in the rack.

  6. To remove a cable, disengage the locks and slowly pull the connector away from the port receptacle. The LED indicator will turn off when the cable is unseated.

On Linux

Get the device location on the PCI bus by running lspci and locating lines with the string “Mellanox Technologies”:


lspci |grep -i Mellanox Network controller: Mellanox Technologies MT27710 Family [ConnectX-4 Lx]

On Windows

  1. Open Device Manager on the server. Click Start => Run, and then enter devmgmt.msc.

  2. Expand System Devices and locate your NVIDIA ConnectX-4 Lx adapter card.

  3. Right click the mouse on your adapter's row and select Properties to display the adapter card properties window.

  4. Click the Details tab and select Hardware Ids (Windows 2012/R2/2016) from the Property pull-down menu.

    PCI Device (Example)


  5. In the Value display box, check the fields VEN and DEV (fields are separated by ‘&’). In the display example above, notice the sub-string “PCI\VEN_15B3&DEV_1003”: VEN is equal to 0x15B3 – this is the Vendor ID; and DEV is equal to 1018 (for ConnectX-4 Lx) – this is a valid PCI Device ID.


    If the PCI device does not have a NVIDIA adapter ID, return to Step 2 to check another device.


    The list of NVIDIA PCI Device IDs can be found at the PCI ID repository.

Safety Precautions

The adapter is installed in a system that operates with voltages that can be lethal. Before uninstalling the adapter card, please observe the following precautions to avoid injury and prevent damage to system components.

  1. Remove any metallic objects from your hands and wrists.

  2. It is strongly recommended to use an ESD strap or other antistatic devices.

  3. Turn off the system and disconnect the power cord from the server.

Card Removal

Please note that the following images are for illustration purposes only.


Please note that the following images are for illustration purposes only.

  1. Verify that the system is powered off and unplugged.

  2. Wait 30 seconds.

  3. To remove the card, disengage the retention mechanisms on the bracket (clips or screws).

  4. Holding the adapter card from its center, gently pull the adapter card out of the PCI Express slot.


  5. When the port connectors reach the top of the chassis window, gently pull the adapter card in parallel to the motherboard.


© Copyright 2023, NVIDIA. Last updated on Jan 14, 2024.