CREATE TABLE table_15261_1 (processor_speed__mhz_ VARCHAR, part_number VARCHAR)

What is the processor speed (mhz) for part number a80486dx4-75?
SELECT COUNT(processor_speed__mhz_) FROM table_15261_1 WHERE part_number = "A80486DX4-75"
SELECT COUNT("processor_speed__mhz_") FROM "table_15261_1" WHERE "A80486DX4-75" = "part_number"