System Installation
RUBY-9712VG2A User’s Manual
3-3
3.2 Main
Memory
RUBY-9712VG2A provides two DDR-SDRAM DIMM sockets to support DDR-
SDRAM as main memory. The maximum memory size can be up to 2GB. Auto
detecting memory clock according to BIOS CMOS settings.
For system compatibility and stability, don’t use memory module without brand.
You can also use single-sided or double-sided DIMM in both slots.
Watch out the contact and lock integrity of memory module with socket, it will
impact on the system reliability. Follow normal procedures to install your DRAM
module into memory socket. Before locking, make sure that all modules have been
fully inserted into the card slots.
Dual Channel DDR DIMMs
Dual Channel DDR memory technology doubles the bandwidth of memory bus.
Adequate or higher bandwidth of memory than processor would increase system
performance. To enable Dual Channel DDR memory technology, you have to
install dual identical memory modules in both memory sockets. Following tables
show bandwidth information of different processor and memory configurations.
CPU FSB
Bandwidth
800MHz 6.4GB/s
533MHz 4.2GB/s
Memory Frequency
Dual Channel DDR
Bandwidth
Single Channel DDR
Bandwidth
400MHz 6.4GB/s 3.2GB/s
333MHz 5.4GB/s 2.7GB/s
Note:
To maintain system stability, don’t change any of DRAM parameters in BIOS setup
to upgrade your system performance without acquiring technical information.
Memory frequency / CPU FSB synchronization
RUBY-9712VG2A support different memory frequencies depending on the CPU
front side bus and the type of DDR DIMM.
CPU FSB
Memory Frequency
800MHz 400MHz
533MHz 333MHz
