This product is a set of four 16GB DDR3 server RAM modules by Samsung, designed for servers only. Each module has a capacity of 16GB, totaling 64GB of memory. These DIMM modules have a bus speed of 12800R and feature ECC memory and registration for reliable performance. Compatible with various HP Proliant server models, this RAM is ideal for enhancing the performance and efficiency of server systems requiring high capacity and error correction capabilities.