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_name_98 ( model_number VARCHAR, gpu_frequency VARCHAR )

### Question ###
What is the model number for the GPU and 320 mhz?

### Accurate SQL ###

SELECT model_number FROM table_name_98 WHERE gpu_frequency = "320 mhz"