iSeries Model 820 153
iSeries Model 820
must then reside on the #2884. Without the #2884, the DIMMS must be paired. With
the #2884, the DIMMs must be in sets of four (quads) of the same capacity
Note: A single pair of DIMMs is not supported on a feature #2884.
In addition, the #2884 can be ordered or installed, at any time, even with eight or fewer
DIMMs present. If a #2884 is installed, all DIMMs must be placed on it.
For the #0151, #0152, #2437, #2438, #2457, and #2458 processors:
• A Base Main Storage Expansion Card (CCIN 2884) is included in the base system and
does not need to be ordered.
• Main storage DIMMs must be plugged onto the Base Main Storage Expansion Card
(CCIN 2884) and must be added in sets of four (quads) of the same capacity and
technology. There is an exception that allows a single set of two main storage DIMMs
if these are the only two on the system.
Note: A single pair of DIMMs is not allowed on these systems with a feature #2884
ordered or present.
If any additional DIMMs are added above the initial two, the initial two must be paired up
to make a quad and then only DIMM quads can subsequently be added. A feature #2884
may be ordered or installed at any time, even if the base main storage expansion card is
not full.
• The #2884 is required when the number of DIMMs exceeds 16.
For the #2884 Main Storage Expansion Card:
• This feature provides for mounting DIMM memory on the Model 820. It contains one
riser card with 16 sockets for placement of 128 MB, 256 MB, or 512 MB DIMMs.
• Maximum: One (not supported on #2435 Processors).
• Using same feature code number within a quad is required. Mixing of quad “groups” on
the same riser card is also allowed.
• For processors #0151, #0152, #2437, and #2438, a #5157 Feature Power Supply
must be present or ordered when a feature #2884 Main Storage Expansion is added or
ordered.
Power and Packaging
The Model 820 does not include an internal battery. An external UPS is recommended to
protect the system unit and any external components against utility power outages. The
Continuously Powered Mainstore (CPM) function is not supported on the 8xx servers. An
external UPS, combined with abnormal IPL improvements in OS/400, provides an equivalent
level of power protection and fast recovery in the event of power failure.
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