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_269920_16 ( speed__ghz_ VARCHAR, model VARCHAR )

### Question ###
What is the speed of the model whose number is W3540?

### Accurate SQL ###

SELECT speed__ghz_ FROM table_269920_16 WHERE model = "W3540"