2 System Board

Memory Controller Hub (8240)

Four-RIMM Memory Expansion Card

Memory Expansion Card Connector

The actual memory array is on a Memory Expansion Card installed in a Memory Expansion Card Connector (MECC) located on the system board.

On the HP Kayak XU800 PC Workstation there are two types of Memory Expansion Cards supporting the following configurations:

Four RIMM sockets support RDRAM ECC and memory modules installed in pairs. Any unused RIMM sockets must contain a continuity module.

RIMM SOCKET A0

RIMM SOCKET B0

RIMM SOCKET A1

RIMM SOCKETB1

Models are supplied with either 128 MB or 256 MB RDRAM ECC main memory. Memory upgrades are available in pairs of RIMMs, with an individual RIMM size of 64 MB, 128 MB, 256 MB or 512 MB. The following diagram shows installed memory. There are always two RIMMs working in parallel.

 

 

 

 

 

 

A0

 

A1

 

 

Memory modules must be

 

 

 

 

installed in pairs (A0-B0).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I840

Rambus Channel A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Memory

 

 

 

 

 

 

 

 

 

 

Controller Hub

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(MCH)

Rambus Channel B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

82840-QP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Upgrades are then installed as pairs in sockets (A1-B1).

Otherwise, continuity modules are installed in sockets (A1-B1).

B0 B1

Each RIMM socket is connected to the SMBus and is described on page 57.

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