Why can't I use DRAM modules with different frequencies than my MacBook on the Mac?

Category : Setup / Operation
Unlike non-Apple computers, the motherboard of a MacBook nearly never supports the installation of memory modules with different frequencies. If you're looking for a module to go with your MacBook, we suggest choosing one that shares the same frequency with what your computer is using to avoid imcompatibility.

Please refer to the following Transcend compatibility website for more information:

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