64-BIT PROCESSOR - A processor that can run a 64-bit OS. The DEC Alpha is 64-bit, and so are Intel's Itanium and AMD's Opteron and Athlon 64 processors. The 386, 486, and Pentium and Pentium II/III/4 are all 32-bit processors, even though the Pentium and newer chips have 64-bit memory buses. |