Memory modules are defined by the number of chips they contain. With DIMMs and 72-pin SIMMs, the module designation refers to the number of data words on the module. For example, an 8x32 DIMM means that 8 million 32-bit words of memory are available to the system.
If another number follows the designation, such as 8x32-60, it refers to the speed of the chips, in this case, 60 nanosecond 32MB DIMMs. Sometimes, there is an "M" for "mega" after the first digit; for example, 8Mx32. See memory module for the different memory types. Following are some common memory module configurations:
168-PIN DIMM
No parity (8-bits) Parity (9 bits)
Config. Size Config. Size
8x32 32MB 4x72 32MB
4x64 32MB 8x72 64MB
16x32 64MB 16x72 128MB
8x64 64MB 32x72 256MB
16x64 128MB 64x72 512MB
32x64 256MB 128x72 1GB
64x64 512MB
128x64 1GB
72-PIN SIMM
No parity (8 bits) Parity (9 bits)
Config. Size Config. Size
1x32 4MB 256x36 1MB
2x32 8MB 512x36 2MB
4x32 16MB 1x36 4MB
8x32 32MB 2x36 8MB
16x32 64MB 4x36 16MB
8x36 32MB
16x36 64MB
30-PIN SIMM
No parity (8 bits) Parity (9 bits)
Config. Size Config. Size
1x2 1MB 1x3 1MB
1x8 1MB 1x9 1MB
2x8 2MB 2x9 2MB
4x8 4MB 4x9 4MB
16x8 16MB 16x9 16MB
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