Operating Memory. Part II

DIMM and DDR

Nowadays the most widely used memory modules are DIMM and DDR (of SDRAM and SDRAM II). In comparison with SIMM-modules, their advantages are increased productivity from synchronization of signals and a special micro chip SPD that contains information about the configuration of this memory module. Such information is not optimal – the manufacturers provide values in SPD-blocks of memory modules enabling to operate on the motherboards of all types that support these modules. This does not guarantee the maximum performance. It should be noted that there are some cheap unnamed memory modules without SPD-blocks which cannot be defined as devices of appropriate use by some motherboards.

To configure memory manually, switch off the device which automatically sets all parameters. To do this, use the parameter “SDRAM Configuration”. Select the following fixed values: 7 ns (143 MHz), 8 ns (125 MHz) and 10 ns (100 MHz). When using fixed values, the maximum performance is equal to 7 ns (143 MHz).