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For the record. I tested Mysql tables in Memory for store some information. And i tested PHP's APC (APCu) for store the same information.

For 58000 registries. (varchar + integer + date).

  1. Original information 24mb in text format (csv format).
  2. PHP's APC uses 44.7mb of RAM.
  3. Mysql's Table uses 575mb of RAM.

The table only has a single index so i don't think that it is the main factor.

Conclusion:

Memory table is not an option for "big" tables because it uses too much memory.