Many non-native speakers says:

Someone has a good / bad memory power.


Someone has a good / bad memory.

Which is more appropriate to native speakers?


"Memory" is, by definition, a kind of "power", at least in the sense of "ability":

memory (n): The faculty by which the mind stores and remembers information.

"Memory power" is therefore redundant and not normally idiomatic:

He has a good memory for faces

If you want to use the word "power" then the "power of recollection" would be fine (often used in the plural):

He has amazing powers of recollection when it comes to the details of his childhood.

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