This is a product part number from NVIDIA, likely for a specialized server or data center component.
The 'SPECTRUM-X SUB SW' suggests it's related to the NVIDIA Spectrum Ethernet switch line, specifically a software component.
The '+' indicates it's a bundle or package.
'P2CMR37' is a specific identifier within the NVIDIA part numbering system, likely denoting features or configurations of the software.
Without more context or access to NVIDIA's internal product catalog, specific technical specifications cannot be determined from the part number alone.