2.5System memory

2.5.1 Overview

This motherboard has four 184-pin Rambus Inline Memory Modules (RIMM) sockets. These sockets support 64Mbit, 128Mbit, and 256Mbit Direct RDRAM technologies.

 

Location

Memory Module

 

Subtotal

 

 

 

 

 

 

 

 

RIMMA1

RDRAM

x 1

 

 

 

(Rows 0&1)

C-RIMM (use when socket will not be populated)

 

 

 

 

 

 

 

 

 

 

 

RIMMA2

RDRAM

x 1

 

 

 

(Rows 2&3)

C-RIMM (use when socket will not be populated)

 

 

 

 

 

 

 

 

 

 

 

RIMMB1

RDRAM

x 1

 

 

 

(Rows 4&5)

C-RIMM (use when socket will not be populated)

 

 

 

 

 

 

 

 

 

 

 

RIMMB2

RDRAM

x 1

 

 

 

(Rows 6&7)

C-RIMM (use when socket will not be populated)

 

 

 

 

 

 

 

 

 

 

 

 

 

TOTAL SYSTEM MEMORY

=

 

 

 

 

 

(2GB Max)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

•The memory configuration of channel A (RIMMA1 and RIMMA2)

and channel B (RIMMB1 and RIMMB2) must be identical (as below).

•C-RIMMs (Continuity RIMM) must be used to complete the sockets that are not populated by RDRAMs. A C-RIMM is necessary to avoid breaking the signal lines, which are a serial connection in a Rambus interface, such as used in this motherboard. This assures the electrical integrity of a Rambus interface.

•When C-RIMMs are required, it is recommended that they be inserted into RIMMA2 and RIMMB2.

a.

C-RIMM

RIMMB2

 

RIMMB1

128MB RDRAM

 

RIMMA2

C-RIMM

 

RIMMA1

128MB RDRAM

b.

128MB RDRAM

RIMMB2

 

RIMMB1

C-RIMM

 

RIMMA2

128MB RDRAM

 

RIMMA1

C-RIMM

c.

128MB RDRAM

RIMMB2

 

RIMMB1

128MB RDRAM

 

RIMMA2

128MB RDRAM

 

RIMMA1

128MB RDRAM

When using only two memory modules, it is recommended that you use configuration a.

16

Chapter 2: Hardware information