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_19161046_1 ( directx VARCHAR, code_name VARCHAR, core___mhz__ VARCHAR )

### Question ###
What's the directx of the model with code name RV770 PRO and a core bigger than 650.0 MHz?

### Accurate SQL ###

SELECT directx FROM table_19161046_1 WHERE code_name = "RV770 PRO" AND core___mhz__ > 650.0