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.