Table schema:
CREATE TABLE table_name_71 (voltage_center__v_ VARCHAR, input_clock__mhz_ VARCHAR, part_number VARCHAR)

Question: Which Voltage Center (V) has an Input Clock (MHz) of 25 x 3, and a Part Number of a80486dx4-75?
SQL: SELECT voltage_center__v_ FROM table_name_71 WHERE input_clock__mhz_ = "25 x 3" AND part_number = "a80486dx4-75"