The slowest DIMM built into the system determines the pace of the bus clock and the memory access for the complete RAM. The modules’ pace and DRAM organisation can differ. It is activated whenever the particular total capacity of the built-in modules is identical in both channels. The Dual Channel (Interleaved) mode provides the highest performance.
Same speed category of the DDR modules (PC2100, PC2700 or PC3200)įind the suitable RAM now Dual Channel (Interleaved) mode. 
Same manufacturer of the module or the DRAM devices. The following requirements within a module pair do not have to be fulfilled: Please note: Configurations that do not fulfil these requirements, automatically work in Single Channel mode. Mirror-inverted assembly of the memory slots. Both modules either only single-sided (1 rank) or only dual-sided (2 rank). Identical DRAM bus width of the DRAMs used on the module pair (x8 or x16). Identical DRAM technology of the module pair (128MB, 256MB, 512MB or 1GB). Identical module capacity of the module pair (128MB, 256MB, 512MB, 1GB, etc.). Arrangement of the DIMMs in pairs in every memory channel (module pair). The Dual Channel mode is activated by the system one by one for each memory channel if you insert two identical DIMMs as follows: Dual Channel (Interleaved) mode (2, 3 or 4 DIMMs)ĭual Channel mode with symmetric assembly – 2 or 4 DIMMs. Dual Channel with symmetric assembly (2 or 4 DIMMs). This is why newer chip sets for DDR2 RAM provide extended possibilities for DDR2, DDR3 and DDR4 systems such as the Dual Channel (Interleaved) mode or the Flex mode. ( Dual Channel with symmetrical assembly)ĭuring its development stages, the Dual Channel mode was improved and the requirements for modules were modified as well. First, we are looking at the Dual Channel mode of chip sets for DDR1 DRAM such as Intel i865, i875, in AMD-CPU integrated Northbridge etc. 
Broadly speaking, in theory a Dual Channel configuration doubles the data transfer rate of your system compared to Single Channel mode: A matching module pair is bundled along with parallel access to both memory channels.īelow, we will explain, which requirements and configurations are necessary for Dual Channel mode operation.
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