Capacity: 2GB * Type: DDR3 (PC3-8500S) * Speed: 1066MHz * Form Factor: Laptop (SO-DIMM) * Timings: CL7 (7-10) * Manufacturer: Nanya Capacity: 1GB * Type: DDR3 (PC3-8500S) * Speed: 1066MHz * Form Factor: Laptop (SO-DIMM) * Timings: CL7 (7-7-10) * Manufacturer: Hynix You can likely combine them (1GB + 2GB) and they will work fine if your device supports it.