Memory Dimms - Compaq AlphaServer ES45 Service Manual

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8.10 Memory DIMMs

DIMMs are manufactured with two types of SRAMs, stacked and unstacked.
Stacked DIMMs provide twice the capacity of unstacked DIMMs and, at the
time of shipment, are the highest capacity DIMMs offered by Compaq. Your
system may have either stacked or unstacked DIMMs.
A memory option consists of a "set" of four DIMMs. The system supports two
sets per "array" and four arrays per system. You can mix stacked and un-
stacked DIMMs within the system, but not within an array. The DIMMs within
an array must be of the same capacity and type (stacked or unstacked) because
of different memory addressing.
When installing sets 0, 1, 2, and 3, an incorrect mix will not occur. When install-
ing sets 4, 5, 6, or 7, however, you must ensure that the four DIMMs being in-
stalled match the type of DIMMs in the existing array. If necessary, rearrange
DIMMs for proper configuration.
Only the following DIMMs and DIMM options can be used in the ES45 system.
Density
128 MB
256 MB
512 MB
1 GB
∗ Toshiba specific DIMM and option.
CAUTION: Using different DIMMs may result in loss of data.
DIMM
DIMM Option (4 DIMMs per)
20-01CBA-09
20-01DBA-09
20-01EBA-09
20-L0FBA-09
FRU Removal and Replacement
MS620-AA (512 MB)
MS620-BA (1 GB)
MS620-CA (2 GB)
MS620-DA (4 GB)∗
8-33

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