HP Kayak XU800 Technical Reference Manual page 41

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