What must be true before a motherboard can take advantage of the triple memory channels on the board?

The motherboard must be configured to accept a particular type of memory.

Explanation:

The motherboard must be configured to accept a particular type of memory, especially when dealing with multi-channel memory. On motherboard, different modes can be configured to run simultaneously. For motherboard to take advantage of the triple memory channels on the board. You can also check the manual that came with the motherboard to know how to configure it.