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_16400024_1 (release_price___usd__ VARCHAR, model_number VARCHAR)

### Question ###
How many release prices are there for the Pentium iii 550?

### Accurate SQL ###

SELECT COUNT(release_price___usd__) FROM table_16400024_1 WHERE model_number = "Pentium III 550"