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For software, 64-bit means code use with 64-bit virtual memory addresses.ģ2-bit operating systems (OS) and applications require 32-bit CPUsĦ4-bit OS requires 64-bit CPU, and 64-bit applications need a 64-bit OS and CPUĪll editions of Windows 8, Windows 7, Windows Vista, and Windows XP, Linux

For software, 32-bit typically means use of 32-bit linear address space.Ħ4-bit architecture is based on registers, address or data buses 64 bits (8 octets) wide. Comparison chart 32-bit versus 64-bit comparison chartģ2-bit architecture is based on registers, address or data buses 32 bits (4 octets) wide.