Windows 7 Ultimate 64-bit with SP1 English (USA), ISO bootable image. Windows 7 system requirements. 1 gigahertz (GHz) or faster 64-bit (x64) processor. 2 gigabyte (GB) RAM (64-bit). 20 GB available hard disk space (32-bit). DirectX 9 graphics device with WDDM 1.0 or higher driver. Additional requirements to use certain features:. Internet access (fees may apply). Depending on resolution, video playback may require additional memory and advanced graphics hardware. Some games and programs might require a graphics card compatible with DirectX 10 or higher for optimal performance. For some Windows Media Center functionality a TV tuner and additional hardware may be required. Windows Touch and Tablet PCs require specific hardware. HomeGroup requires a network and PCs running Windows 7. DVD/CD authoring requires a compatible optical drive. Windows XP Mode requires an additional 1 GB of RAM and an additional 15 GB of available hard disk space. PCs with multi-core processors:.