Must the dual-channel memory bar be of the same size?

Q: Does the dual-channel memory slot necessarily have two memory with the same capacity and frequency?

Answer: Unwanted Intel has elastic dual channel, support different capacity of memory to establish dual channel, as for the frequency is the lowest use, timing according to the longest. If not compatible with the software can be excluded because the CPU or the North Bridge memory controller is not perfect, then need to find two of the same model of memory.

This is also the reason to always recommend using the same frequency of memory as the brand.