Configuring And Upgrading Dram Memory; Configuring Dram Memory; Alphapc 164 Dram Memory Configurations - DEC AlphaPC 164 User Manual

5 Configuring and Upgrading DRAM
Memory
For higher system speed or greater throughput, DRAM memory can be upgraded
either by replacing SIMMs with those of greater size, or by widening the memory
bus from 128 bits to 256 bits by adding more SIMMs.
Note:

5.1 Configuring DRAM Memory

Table 22 lists the DRAM memory configurations available. Refer to Figure 1 for
SIMM connector location.
Table 22 AlphaPC 164 DRAM Memory Configurations
Total Memory
16MB
32MB
64MB
128MB
256MB
Total Memory
32MB
64MB
128MB
256MB
512MB
When configuring or upgrading DRAM, the following rules must be
observed:
All SIMMs must be 36-bit and have a 70-ns or faster access time.
All SIMMs must be of equal size.
128-Bit Memory Mode (J1 In)
J5 Through J8 Populated
with SIMM Sizes...
1Mb 36
X
2Mb 36
X
4Mb 36
X
8Mb 36
X
16Mb 36
X
256-Bit Memory Mode (J1 Out)
J5 Through J12 Populated
with SIMM Sizes...
1Mb 36
X
2Mb 36
X
4Mb 36
X
8Mb 36
X
16Mb 36
X

Configuring and Upgrading DRAM Memory

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