8GB Total memory using 2pc of 4GB 1333MHz Module 240pin dimm DDR3 10600. 
Lifetime warranty for exchange by Computer Memory Solutions
Brand Computer Memory Solutions
Guaranteed to work or you get all of your money back including shipping.

Max Memory: 16GB
Sockets: 4 (2 banks of 2)
COMPATIBLE WITH:

ASUS Essentio CM1630


MODULES MUST BE ORDERED AND INSTALLED IN PAIRS for Dual Channel mode. This is a 2pcs kit  for Dual Channel mode.

If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation). A 64-bit Operating System is required to utilize more than 4GB of memory.