This Kingston MB1600/8GB DDR3 SDRAM module is a great addition to your computer's memory. With a bus speed of PC3L-12800S(DDR3-1600), this SO-DIMM form factor module is perfect for your laptop. This module has been carefully taken from an IMAC 1419 and is in excellent working order. The module has a capacity of 8GB and is a single module. It is compatible with a range of computers and is perfect for those who need to upgrade their memory. With its high-quality construction and reliable performance, this Kingston module is an excellent choice for anyone who needs more memory in their computer.