what is ur config???
Dual-channel architecture DDR/DDR2 SDRAM describes a motherboard technology that effectively doubles data throughput from RAM to the memory controller.
In order to achieve this, the DDR/DDR2 SDRAM memory modules must be installed into matching banks, which are usually color coded on the motherboard. It is not required that identical modules are used, but it is often recommended. One module of 512MB RAM could be installed in bank one and a 1GB module could be installed in bank two. Modules rated at different speeds can be run in dual channel, although the motherboard will then run all memory modules at the speed of the slowest module.