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_71 ( digital_analog_signal VARCHAR, available_interface VARCHAR, retail_name VARCHAR )

### Question ###
What is the Digital/analog signal with an Available interface with pci express, with Retail name with all-in-wonder x600 pro?

### Accurate SQL ###

SELECT digital_analog_signal FROM table_name_71 WHERE available_interface = "pci express" AND retail_name = "all-in-wonder x600 pro"