CREATE TABLE table_name_15 (frequency VARCHAR, socket VARCHAR, model_number VARCHAR)

Which Frequency has a Socket of socket 370, and a Model Number of c3 1.4a?
SELECT frequency FROM table_name_15 WHERE socket = "socket 370" AND model_number = "c3 1.4a"
SELECT "frequency" FROM "table_name_15" WHERE "c3 1.4a" = "model_number" AND "socket 370" = "socket"