The OWC 4GB (2x 2GB) 1333Mhz PC3-10600 DDR3 SO-DIMM 204-Pin Memory Upgrade Kit is a high-quality memory upgrade kit designed for computers that require DDR3 SDRAM RAM. This kit includes two 2GB SO-DIMM modules with a total capacity of 4GB, ensuring optimal performance and efficiency. The memory modules are equipped with ECC memory and fully buffered technology, providing reliable and stable performance for your system. Upgrade your computer's memory capacity with this reliable and efficient memory upgrade kit from OWC.