Table schema:
CREATE TABLE table_name_64 (date INTEGER, cores_per_die___dies_per_module VARCHAR, clock VARCHAR)

Question: What is the latest date with Cores per die / Dies per module of 2 / 1, and a Clock of 1.4-1.6ghz?
SQL: SELECT MAX(date) FROM table_name_64 WHERE cores_per_die___dies_per_module = "2 / 1" AND clock = "1.4-1.6ghz"