The important memory specifications that you need to worry about are the memory speed and the voltage.
The processor you are using supports DDR3 memory and the speeds needs to be 1333Mhz or 1600Mhz, then the voltage need to be 1.5V.
The CAS latency (CL) is the delay time between the memory controller and the memory module to access a particular memory column and then to access the data requested. Therefore, CL9 will give you better performance than CL11, however the difference will be in nanoseconds.
When choosing the RAM, please make sure it is totally compatible with your processor.