IBM PC 300PL manual System memory, Rimm

Chapter 2. System board features

System memory

The system memory interface is controlled by the Intel 820 chip set. Rambus dynamic memory (RDRAM) is standard.

The maximum amount of addressable system memory is 1 GB. For memory expansion, the sy provides two Rambus inline memory module (RIMM) connectors. The system board also suppor memory and PC800 memory RIMMs in sizes of 64 MB, 128 MB, 256 MB, and 512 MB. The amount memory that is preinstalled varies by model.

The following information applies to system memory:

Ÿ

ECC or non-ECC

RDRAM is

standard.

Ÿ

The

maximum

height

of memory modules is 6.35 cm (2.5 in.).

Ÿ

Each

memory

connector

supports

a

maximum of 512

MB

of

memory,

when

available.

Ÿ

Install

only

ECC RIMMS to enable ECC. If you use ECC

and

non-ECC

memory

together,

all in

memory

will

function as non-ECC memory.

Ÿ

RIMM

connectors

do

not

support

dual

inline

memory

modules

(DIMMs).

Ÿ

Any

connector

that

does

not have

a

RIMM

installedcontinmuisty haveRIMM(Ca-RIMM),

a

module

that

looks

like a RIMM but has no memory on it. A

continuity

RIMM is

used to

conti

connection on

a

RIMM

connector

that

does

not have

memory

installed

in

it.

Ÿ Use PC700 or PC800 RIMMs only.

ŸMaximum system memory can be auto-detected and auto-configured using serial presenc configuration interface (BIOS specific).

The	following	table shows the		possible configuration of RIMMs and continuity RIMMs that
the PC 300PL Personal Computer.
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

For information on the pin assignments for the memory-module connectors, see “Memory conne page 26.

Chapter 2. System board features5