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Memory Cards
Up to 8 single-wide, 4 double-wide (8 GB), or a combination of single-wide or double-wide
PMB memory cards may occupy PMB card slots 1-14. (PMB card slots 1 through 7 are
single-wide slots. Slots 8 through15 are double-wide slots.)
Memory cards must be installed after processor and bus converter cards, respectively, and
in the following sequence, and according to the following rules:
1. Load 8 GB memory boards in the following sequence: 8, 12, 9, 10, 6, 4. If a slot is
occupied with a processor or bus converter board, use the next available slot.
NOTE
If there is a single-wide memory board (64, 128, 256, 512, or 768 MB) in a
double-wide slot, you will have to relocate it to another slot.
2. Load all other memory cards in the following sequence: 4, 6, 8, 9, 10, 11, 12, 13, 14, 7, 5,
3, 2, and 1. If a slot is occupied, use the next available slot.
CAUTION
Minimum memory for systems with a UPS: 128MB for 890, 256MB
for T-Class or 99x Systems.
Minimum memory for 890/990/992 Systems without a UPS: For
powerfail recovery to function properly on these systems, a minimum
amount of memory must be installed in the system:
890/990/992 Systems with one or two processors: 128MB of memory
890 Systems with three processors: 192MB of memory
890 Systems with four processors: 256MB of memory
990/992 Systems with three or four processors: 256MB of memory
991/995/T500, 996/T520, and 997/T600 Systems with one processor:
256MB of memory. See also Table 3-3.
Failure to meet the minimum memory requirements will result in lost
data during a powerfail recovery.
The 512-Mbyte and 768-Mbyte cards are not supported on 990/992 or 890 Systems.
Minimum Number of Memory Banks
For best performance, the memory configuration should have at least four banks of the
same size (64 MB or 256 MB). For example, consider a system that currently has only
64-MB banks. If you want to add 512-MB cards (with two 256-MB banks) or 768-MB cards
(with three 256-MB cards), add sufficient cards so the resulting configuration will have at
least four 256-MB banks. This could be accomplished with two 512-MB cards (making a
total of four 256-MB banks) or with one 512-MB and one 768-MB card (total of five 256-MB
banks).
Chapter 3
Installation
PMB Cards
3-17
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