Windows 7 Ultimate is the highest in all editions, and was targeted at home PC users. Ultimate and Enterprise editions are almost identical in terms of features, only licensing plans and upgrade options are different. The 32-bit version of Windows 7 Ultimate support up to 4 GB RAM while the 64-bit version supports up to 192 GB RAM. Compared to Home Premium and Professional, the Ultimate version has more features like BitLocker Drive Encryption and Multilingual User Interface. Windows 7 supports a maximum of 1 physical processor in Home Basic and Home Premium Edition, while Ultimate Edition supports 2 physical processor.