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PCA-6187 User’s Manual 14
1.9.1 CPU FSB and memory speed
The PCA-6187 can accept DDR SDRAM memory chips without parity.
Also note: The PCA-6187 accepts PC2100 (DDR266), PC2700 (DDR
333) and PC3200 (DDR 400) DDR SDRAM, depending on the CPU
front side bus frequency (FSB). Please refer below table for the relation-
ship between the CPU FSB and memory speed.
The PCA-6187 does not support ECC (error checking and correction).
Memory modules with 9 SDRAM chips/side support ECC; modules with
8 chips/side do not support ECC.
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.
Table 1.6: CPU FSB and memory speed
Memory
Speed
Processor FSB frequency Memory speed Outcome
DDR400 Pentium 4 800 MHz 400 MHz
DDR333 Pentium 4 800 MHz 320 MHz
Pentium 4 533MHz 333 MHz
Pentium 4
or Celeron
400 MHz 266 MHz
DDR266 Pentium 4 533 or 400 MHz 266 MHz
Celeron 400 MHz 266 MHz