I have a bad memory for names.

我不善于记名字。

Most people confess to a bad memory.

大多数人都承认记性差。

Forget it. I have a bad memory.

算了算了，我记性不好。

He has a bad memory for dates.

他对日期的记忆力很差。

Bad memory (such as excessive ECCs).

坏内存(比如过多的ECC)。