Specifications

5–2 Upgrading the AlphaPC 164
Subject to Change – 17 January 1997
Upgrading DRAM Memory
5.2 Upgrading DRAM Memory
There are three options for upgrading DRAM memory (see Table 5–2).
Table 5–1 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
Table 5–2 Memory Upgrade Options
Option
Memory Bus
Width Before
Memory Bus
Width After Upgrade Possibilities
1 128-bit 128-bit Replace the 4 SIMMs in sockets J5 through J8
with SIMMs of greater size, thus retaining the
128-bit memory bus width.
2 128-bit 256-bit Add 4 SIMMs in sockets J9 through J12 with
sizes equal to those in sockets J5 through J8,
thus widening the memory bus width to 256
bits.
3 256-bit 256-bit Replace the 8 SIMMs in sockets J5 through J12
with SIMMs of greater size.