User`s manual

512 and 1024 MB. The sockets can be filled in any combination with

DIMMs of any size, giving a total memory size between 128 MB and 4

GB.

Note: System resources such as PCI and AGP cards require phys-

ical memory address locations that reduce available memory

addresses above 3GB. This may result in less than 4GB of mem-

ory being available to the operating system and applications.

Limitation: The system configuration does not show the memory

bank when booting.

1.9.1 CPU FSB and memory speed

The AIMB-742 can accept DDR SDRAM memory chips without parity.

Also note: The AIMB-742 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 AIMB-742 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

Table 1.5: 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