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When RAM modules of different speeds are used in a system, they will generally operate at the speed of the slowest module installed. This phenomenon occurs due to the way memory channels are managed by the memory controller on the motherboard, which defaults to the capabilities of the least capable component to ensure system stability and compatibility.

By operating all the modules at the slowest speed, the system can avoid potential conflicts and timing issues that may arise from mismatched speeds, which could lead to instability, crashes, or data corruption if different speeds were to operate simultaneously. This approach ensures that all installed modules can work together reliably, albeit at a reduced performance level compared to what might be possible if all modules were of the same higher speed.

This behavior is critical for users to understand when upgrading or customizing their RAM, as mixing different speeds can lead to performance limitations, and they should ideally match the specifications of the RAM they are replacing or adding to achieve optimal performance.