The Kingston 4GB DDR3-1333 PC3L-10600E ECC Memory Module (Model: KR1P74-HYC) is specifically designed for servers. It features ECC memory technology, which helps to detect and correct data corruption to ensure system reliability. This UDIMM module has a capacity of 4GB and operates at a bus speed of PC3-10600 (DDR3-1333). The unit quantity includes 4 memory modules in the pack, making it suitable for upgrading server memory capacity efficiently.