User manual

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1.9 System Memory
The PCA-6009 has four sockets for 240-pin dual inline memory modules
(DIMMs) in two separated memory channels. It can operate with single
channel or dual channel modules. We recommend to use dual channel
mode to provide optimized performance.
All these sockets use 1.8 V unbuffered double data rate synchronous
DRAMs (DDRII SDRAM). They are available in capacities of 256, 512
and 1024 MB. The sockets can be filled in any combination with DIMMs
of any size, giving a total memory size between 256 MB and 2 GB.
1.9.1 CPU FSB and memory speed
The PCA-6009 can accept DDRII SDRAM memory chips without parity.
Also note: The PCA-6009 accepts DDRII 400MHz SDRAM and DDRII
533MHz SDRAM, depending on the CPU front side bus frequency
(FSB).
1.9.2 Dual channel configuration
The two DIMM sockets are arranged in two channels: DIMM2 in channel
A; DIMM4 in channel B. To enable dual channel operation, please install
a matched pair of DIMMs in DIMM2 & DIMM4
"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.