CREATE TABLE table_name_71 (voltage_center__v_ VARCHAR(255), input_clock__mhz_ VARCHAR(255), part_number VARCHAR(255))
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"