This is a Lenovo ThinkSystem server memory module: a 64GB TruDDR5 RDIMM running at 4800MHz in a 2Rx4 (dual-rank, x4) configuration, described as '10x4' which typically refers to the DRAM chip organisation on the module. TruDDR5 is Lenovo's branding for memory that's been tested and validated specifically for its ThinkSystem server platforms, going beyond generic DDR5 in terms of guaranteed compatibility and reliability at scale. This is a component sold to expand or upgrade RAM capacity in an existing compatible Lenovo server, not a standalone product — buyers should confirm their specific server model supports 4800MHz TruDDR5 RDIMMs before purchasing.