Why does server throw Q Code 19 only when both CPUs installed?

memory boot hardware central-processing-unit asus

Received an answer from a user on another forum:

The 1620V4 only supports single CPU configurations: https://www.intel.com/content/www/us/en/products/sku/92991/intel-xeon-processor-e51620-v4-10m-cache-3-50-ghz/specifications.html

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