[ The PC Guide | Systems and Components Reference Guide | The Processor | Processor Architecture and
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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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