HP XM600 - Kayak - 128 MB RAM Technical Reference Manual page 48

2 System Board
Memory Controller Hub (MCH) 82820
RDRAM models of the HP Kayak XM600 PC Workstation are supplied with
128 MB of RDRAM unbuffered ECC main memory installed in the RIMM0
socket. Memory upgrades are available in 64 MB, 128 MB, 256 MB RDRAM
modules.
SDRAM Memory Expansion Card Slot
SDRAM models of the HP Kayak XM600 are supplied with a Memory
Expansion Card supporting two Synchronized Dynamic RAM (SDRAM)
100 MHz memory modules.
The MTH (Memory Translator Hub) provides support for two double-sided
100 MHz SDRAM DIMM sockets.
The Memory Expansion Card is installed in a reserved socket on the
system board (the socket furthest from the processor(s)). This is not to be
confused with the AGP card or a PCI card (it is retained in a similar
manner, so is easy to mistake).
When the Memory Expansion Card is installed, the two unused RIMM
sockets (RIMM0 and RIMM1) must be filled with RDRAM continuity
modules. Never leave these sockets empty and do not insert RDRAM
modules in them.
If two memory modules are installed in the Memory Expansion Card, and
they do not have identical capacities, then the module with the highest
capacity must be installed in the memory socket nearest to the system
board.
If only one memory module is installed, it can be installed in either socket.
The unused socket should be left empty; no continuity module or terminator
is required.
The MTH allows bridging of a single SDRAM channel on to the Direct
Rambus channel. The MTH also translates RDRAM and SDRAM protocols,
thus enabling the DIMM Memory Expansion Card to be used on the Rambus
channel.
SDRAM models of the HP Kayak XM600 PC Workstation are supplied with
128 MB of SDRAM unbuffered non-ECC main memory. Memory upgrades
are available in 64 MB, 128 MB, 256 MB unbuffered 100 MHz non-ECC
SDRAM modules.
The MTH provides support for two double-sided 100 MHz SDRAM DIMM
sockets. Each DIMM socket is connected to the SMBus and is described on
page 59.
48