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[ The PC Guide | Systems and Components Reference Guide | The Processor | Processor Architecture and Operation | External Processor Interfaces and Operation ]

Address Bus Size and Maximum RAM for Specific Processors

The table below shows the address bus width and maximum system memory for various processors. 32 bit address bus and 4 GB maximum addressability are by far the most common, and since it hasn't been a limiting factor in the vast majority of cases, there hasn't been a great impetus to widen the address space. Look here to see full details of all the characteristics for any specific processor.

Processors

Address Bus Width (bits)

Maximum
System RAM

8088, 8086

20

1 MB

80286, 80386SX

24

16 MB

80386DX, 80486DX, 80486SX, 80486DX2, 80486DX4, AMD 5x86, Cyrix 5x86, Pentium, Pentium OverDrive, Pentium with MMX, Pentium with MMX OverDrive, 6x86, K5, K6, 6x86MX

32

4 GB

Pentium Pro, Pentium II

36

64 GB

Next: System Clocks


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