Windows 7 and 8 Hardware Restrictions and System Requirements

Hardware Restrictions	Windows 7 Home Premium allows only 16GB of RAM while Ultimate allows 192GB of RAM	Windows Vista Home Premium allows only 16GB of RAM while Ultimate allows 128GB of RAM

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Requirements


Processor             1 GHz                                                       800 MHz


RAM                    1 GB (32-bit)
                             2 GB (64-bit)                                           512MB


Free disk space    16 GB (32-bit)                                         15 GB (20 GB partition)
                             20GB  (64-bit)