I want to compare Seagate 3tb (ST3000DM001) 64mb sata and Seagate 4tb (ST4000DM000) 64mb sata. aside from their space the 3TB has a 7200 RPM and the 4TB has only 5900 RPM would that affect the performance especially in gaming because that is my priority in buying a larger space for storage. Oh and is there such thing as Seagate 4tb with a 7200 RPM ?