Configuring and Upgrading DRAM Memory
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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:
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.
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
128-Bit Memory Mode (J1 In)
J5 Through J8 Populated
with SIMM Sizes...
16MB
1Mb
X
36
32MB
2Mb
X
36
64MB
4Mb
X
36
128MB
8Mb
X
36
256MB
16Mb
X
36
Total Memory
256-Bit Memory Mode (J1 Out)
J5 Through J12 Populated
with SIMM Sizes...
32MB
1Mb
X
36
64MB
2Mb
X
36
128MB
4Mb
X
36
256MB
8Mb
X
36
512MB
16Mb
X
36
