Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
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?
### Answer:
SELECT directx FROM table_19161046_1 WHERE code_name = "RV770 PRO" AND core___mhz__ > 650.0