Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_15261_1 (processor_speed__mhz_ VARCHAR, part_number VARCHAR)

### Question ###
What is the processor speed (mhz) for part number a80486dx4-75?

### Accurate SQL ###

SELECT COUNT(processor_speed__mhz_) FROM table_15261_1 WHERE part_number = "A80486DX4-75"