The Samsung 2 x 2GB Laptop RAM Memory is a set of two DDR3 SDRAM modules with a total capacity of 4GB. Each module has a capacity of 2GB, and they are designed in a SO-DIMM form factor with 204 pins for compatibility with laptops that require this type of memory module. The model is M4171B5773CHS-CH9, and the bus speed is PC-10600S. This RAM upgrade is ideal for increasing the performance and capacity of a laptop for improved multitasking and smoother operation.