Advantech PCA-6187 user manual CPU FSB and memory speed, Dual channel configuration

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.

Table 1.6: CPU FSB and memory speed

Memory	Processor	FSB frequency	Memory speed Outcome
Speed
DDR400	Pentium 4	800 MHz	400 MHz
DDR333	Pentium 4	800 MHz	320 MHz
	Pentium 4	533MHz	333 MHz
	Pentium 4	400 MHz	266 MHz
	or Celeron
DDR266	Pentium 4	533 or 400 MHz	266 MHz
	Celeron	400 MHz	266 MHz

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.

PCA-6187User’s Manual 14