This is a SK hynix 4GB DDR4 memory module, specifically model HMA851U6AFR6N-UH.It operates at a speed of 2400MHz (PC4-19200) and is designed for desktop systems (DIMM).The module has a configuration of 1Rx16, meaning it has one rank of memory chips using x16 organization.It is a non-ECC (Error-Correcting Code) unbuffered module.