Monitoring; Thermal Sensors - Nvidia ConnectX-7 User Manual

Monitoring

Thermal Sensors

The adapter card incorporates the ConnectX IC, which operates in the range of temperatures
between 0°C and 105°C.
Three thermal threshold definitions impact the overall system operation state:
• Warning – 105°C: On managed systems only: When the device crosses the 105°C threshold, a
Warning Threshold message is issued by the management SW, indicating to system
administration that the card has crossed the warning threshold. Note that this temperature
threshold does not require nor lead to any action by hardware (such as adapter card
shutdown).
• Critical – 115°C: When the device crosses this temperature, the firmware automatically shuts
down the device.
• Emergency – 130°C: If the firmware fails to shut down the device upon crossing the critical
threshold, the device automatically shuts down upon crossing the emergency (130°C)
threshold.
The card's thermal sensors can be read through the system's SMBus. The user can read these
thermal sensors and adapt the system airflow following the readouts and the needs of the above-
mentioned IC thermal
Heatsink
A heatsink is attached to the ConnectX-7 IC to dissipate the heat. ConnectX-7 IC has a thermal
shutdown safety mechanism that automatically shuts down the ConnectX-7 card in case of a high-
temperature event, improper thermal coupling, or heatsink removal.
For the required airflow (LFM) per OPN, please refer to Specifications.
The below table lists the heatsink proprieties per OPN.
OPN
MCX753436AS-HEAB and MCX753436MS-HEAB
MCX75343AMC-NEAC and
Attached by using two spring-loaded push pins.
MCX75343AMS-NEAC Attached by using two spring-loaded push pins and three L-
shaped mechanical holders, as can be seen in the above
mechanical drawing.
These L-shaped mechanical holders connect the PCB to the
heatsink to create a stiffener.
Heatsink
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