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Chapter 2. System board features
System memory
The system memory interface is controlled by the Intel 820 chip set. Rambus dynamic random access
memory (RDRAM) is standard.
The maximum amount of addressable system memory is 1 GB. For memory expansion, the system board
provides two Rambus inline memory module (RIMM) connectors. The system board also supports PC700
memory and PC800 memory RIMMs in sizes of 64 MB, 128 MB, 256 MB, and 512 MB. The amount of
memory that is preinstalled varies by model.
The following information applies to system memory:
ECC or non-ECC RDRAM is standard.
The maximum height of memory modules is 6.35 cm (2.5 in.).
Each memory connector supports a maximum of 512 MB of memory, when available.
Install only ECC RIMMS to enable ECC. If you use ECC and non-ECC memory together, all installed
memory will function as non-ECC memory.
RIMM connectors do not support dual inline memory modules (DIMMs).
Any connector that does not have a RIMM installed must have a
continuity RIMM
(C-RIMM), a module
that looks like a RIMM but has no memory on it. A continuity RIMM is used to continue the
connection on a RIMM connector that does not have memory installed in it.
Use PC700 or PC800 RIMMs only.
Maximum system memory can be auto-detected and auto-configured using serial presence detect and
configuration interface (BIOS specific).
The following table shows the possible configuration of RIMMs and continuity RIMMs that can be used in
the PC 300PL Personal Computer.
For information on the pin assignments for the memory-module connectors, see “Memory connectors” on
page 26.
Figure 1. Memory configurations for 133 MHz FSB
RIMM 1 RIMM 2 Functions as
PC700 PC700 PC700
PC700 PC800 PC700
PC700 C-RIMM PC700
PC800 PC800 PC800
PC800 C-RIMM PC800
C-RIMM C-RIMM Invalid
Any RIMM No RIMM Invalid
No RIMM No RIMM Invalid
No RIMM C-RIMM Invalid
Chapter 2. System board features 5