CREATE TABLE table_19161046_1 (directx VARCHAR(255), code_name VARCHAR(255), core___mhz__ VARCHAR(255))
What's the directx of the model with code name RV770 PRO and a core bigger than 650.0 MHz?
    
SQL: SELECT directx FROM table_19161046_1 WHERE code_name = "RV770 PRO" AND core___mhz__ > 650.0