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_29 ( v_core VARCHAR, stepping VARCHAR, frequency VARCHAR )

### Question ###
What is the v-core for a stepping of G1 and frequency of 1900MHz?

### Accurate SQL ###

SELECT v_core FROM table_name_29 WHERE stepping = "g1" AND frequency = "1900mhz"