Hi I was wondering which one to buy between these 2 internal SATA hard drives. WD caviar green has Intellipower, which is SUPPOSED to vary from 5400 to 7200rpm, and the Samsung one is 7200rpm. Both have similar prices and memory size. Caviar green has 64mb of cache, and Samsung has 32mb of cache. Would the energy saving side of caviar green affect the performance alot and would I notice it? If so, which one to get? Thanks