Table schema:
CREATE TABLE table_name_78 (turbo VARCHAR, model_number VARCHAR, l2_cache VARCHAR, release_date VARCHAR)

Question: What turbo has a L2 cache of 4 × 256 kb, a release date of June 2013, and a Model number of core i7-4770s?
SQL: SELECT turbo FROM table_name_78 WHERE l2_cache = "4 × 256 kb" AND release_date = "june 2013" AND model_number = "core i7-4770s"