1PC OF 4GB 204p PC3-10600 CL9 16c 256x8 DDR3-1333 SODIMM. Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from CMS Compatible with: ASUS/ASmobile X54 Notebook X54C-BBK15, X54C-BBK17 Standard Memory: 2 GB (Non-removable) or 4 GB (Non-removable) Maximum Memory: 6 GB with 2GB onboard memory 8 GB with 4GB onboard memory Expansion: 1 Socket(s) Comments If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation). Maximum configurations require a 64-bit operating system. DDR3 1333MHz modules automatically clock down to 1066MHz or lower depending on which processor is used.