User`s manual

PCA-6190 User’s Manual 14
1.9.1 CPU FSB and memory speed
The PCA-6190 can accept DDRII SDRAM memory chips without parity.
Also note: The PCA-6190 accepts DDRII 400MHz SDRAM and DDRII
533MHz SDRAM, depending on the CPU front side bus frequency
(FSB). Please refer below table for the relationship between the CPU FSB
and memory speed.
1.9.2 Dual channel configuration
The four DIMM sockets are arranged in two channels: DIMM1 &
DIMM2 in channel A; DIMM3 & DIMM4 in channel B. To enable dual
channel operation, please install a matched pair of DIMMs in DIMM1 &
DIMM3 (green sockets). If additional memory is to be used, another
matched pair of DIMMs have to be installed in DIMM2 & DIMM4 (pur-
ple sockets).
"Matched pair of DIMMs" means: same in speed (DDR266, DDR333,
DDR400), same in size (128MB, 256MB, 512MB or 1GB), same in chip
density (128 Mb, 256Mb or 512Mb and same in CSA latency. Any other
memory configuration will result in single channel memory operation.
1.10 Memory Installation Procedures
To install DIMMs, first make sure the two handles of the DIMM socket
are in the "open" position. i.e. The handles lean outward. Slowly slide the
DIMM module along the plastic guides on both ends of the socket. Then
press the DIMM module right down into the socket, until you hear a
click. This is when the two handles have automatically locked the mem-
ory module into the correct position of the DIMM socket. To remove the
memory module, just push both handles outward, and the memory mod-
ule will be ejected by the mechanism in the socket.
Note: System resources such as PCI require physical
memory address locations that reduce available
memory addresses above 3GB. This may result
in less than 4GB of memory being available to
the operating system and applications.