Table schema:
CREATE TABLE table_name_30 (voltage_range VARCHAR, fsb_speed VARCHAR, clock_speed VARCHAR)

Question: Name the Voltage Range which has a FSB Speed of 400 mhz, and a Clock Speed of 1 ghz?
SQL: SELECT voltage_range FROM table_name_30 WHERE fsb_speed = "400 mhz" AND clock_speed = "1 ghz"