Table schema:
CREATE TABLE table_name_63 (clock_speed VARCHAR, fsb_speed VARCHAR, model_number VARCHAR)

Question: Which Clock Speed has a FSB Speed of 400 mhz, and a Model Number of c7-m 794?
SQL: SELECT clock_speed FROM table_name_63 WHERE fsb_speed = "400 mhz" AND model_number = "c7-m 794"