HP Kayak XU800 Series, Technical Reference Manual

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41
2 System Board
Memory Controller Hub (8240)
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 Memory
Expansion Card
Four RIMM sockets support RDRAM ECC and memory modules installed in
pairs
. Any unused RIMM sockets must contain a continuity module.
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.
Each RIMM socket is connected to the SMBus and is described on page 57 .
RIMM SOCKET A0
RIMM SOCKET B0
RIMM SOCKET A1
RIMM SOCKETB1
I840
Memory
Controller Hub
(MCH)
82840-QP
Rambus Channel A
Rambus Channel B
A0 A1
B0 B1
Upgrades are then
installed as
pairs in
sockets (A1-B1).
Otherwise, continuity
modules are installed
in sockets (A1-B1).
Memory modules must be
installed in pairs (A0-B0).