This listing includes two (2) laptop RAM modules, offering a total of 8GB for your compatible notebook or small form factor PC. Both modules are DDR3 SO-DIMM type, running at a bus speed of PC3-10600S (1333MHz). One module is from Samsung, and the other is from Micron, each with a capacity of 4GB. These modules are ideal for upgrading or replacing existing memory to improve your system's performance and multitasking capabilities. Please verify compatibility with your device before purchasing.