Comment by hylaride

> Is there even a case where more RAM is not really better, except for its cost?

It depends. It takes more energy, which can be undesirable in battery powered devices like laptops and phones. Higher end memory can also generate more heat, which can be an issue.

But otherwise more RAM is usually better. Many OS's will dynamically use otherwise unused RAM space to cache filesystem reads, making subsequent reads faster and many databases will prefetch into memory if it is available, too.