This paper introduces the LRDIMM, a new type of memory module for high-capacity servers and high-performance computing platforms. LRDIMM is an abbreviation for Load Reduced Dual Inline Memory Module, the newest type of DIMM supporting DDR3 SDRAM main memory. The LRDIMM is fully pin-compatible with existing JEDEC-standard DDR3 DIMM sockets, and supports higher system memory capacities when enabled in the system BIOS. The LRDIMM presents a new set of dynamics into the memory system performance characteristics in terms of bandwidth, capacity, functionality and power.