HP D5970A - NetServer - LCII Installation Manual page 45

Chapter 5
All DIMMs within a bank must be identical in size and speed. A bank
must contain either all 64 MB DIMMs or all 256 MB DIMMs.
Banks of 64 MB DIMMs and 256 MB DIMMs can coexist on the same
memory board.
The minimum memory configuration is four 64 MB DIMMs in one
bank on the primary (right-hand) memory board, and no DIMMs on
the left-hand board. When the system has two memory boards but only
four DIMMs, all four DIMMs must be on the primary memory board.
(The left-hand, secondary, board must always be in the system, even if it
holds no DIMMs.)
For board-to-board interleaving, each memory board must hold the
same number of DIMMs. If one board holds two types of DIMMs, the
other board must also, and in the same banks. (For example, if one
memory board holds eight 256 MB DIMMs in Banks A and B and eight
64 MB DIMMs in Banks C and D, the other board must match this
configuration exactly if card-to-card interleaving is to take place.)
NOTE
There is no special order for interspersing banks of 64 MB and
256 MB DIMMs on memory boards. Any arrangement is
allowed.
Board-to-board interleaving offers enhanced performance, and is recommended.
Figures 5-4 and 5-5 show memory configurations for eight, 16, 24, and 32
DIMMs using two interleaved memory boards. The diagram assumes that
corresponding banks on each board both hold the same size of DIMM module.
Installing Additional Memory
37