This appears to be a custom model or a specific configuration for a Lenovo ThinkSystem server, indicated by the 'CUSTOM MODEL' and 'NETWORK CENTER' designation.
The part number '7Z71S30D00' is likely an internal Lenovo identifier for this specific configuration.
Without further information or access to Lenovo's internal product catalog, it is difficult to provide detailed specifications.
Custom models are often built to meet specific customer requirements and may not have publicly documented standard specifications.