The 4X77A77029 is a ThinkSystem 16GB TruDDR5 4800MHz (1Rx8) RDIMM from Lenovo.
It is a part of the DDR5 10x4 RDIMMs - 4800 MHz series. The TruDDR5 memory delivers trusted, tested, quality, performance, and reliability throughout the ThinkSystem portfolio. Lenovo uses the highest quality industry-standard memory components sourced from Tier 1 DRAM suppliers.
Only memory that meets these strict requirements are selected for memory in Lenovo servers. It is then compatibility tested and tuned on every ThinkSystem server to maximize reliability.