CCSM composed of four separate models: atmosphere (CAM4), ocean (POP2), land surface (CLM4) and sea-ice (CICE4). CCSM was developed in cooperation with NFS, DOE, NASA, and NCAR. The presentation provides information on CCSM productivity, how to optimize and compile the code for highest performance and efficiency, and the effect HPC cluster components (HW and SW) have on CCSM performance.