text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_25839957_5 (core_clock___mhz__ VARCHAR, memory_bandwidth___gb_s__ VARCHAR)
  ### Question:
  What core clocks ( mhz ) have a 21.3 memory bandwidth ( gb/s )?
  ### Answer:
  SELECT core_clock___mhz__ FROM table_25839957_5 WHERE memory_bandwidth___gb_s__ = "21.3"