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_2394927_1 (max_downstream_throughput___mbit_s__ VARCHAR, profile VARCHAR)

### Question ###
List all mbit/s with profiles of 8b.

### Accurate SQL ###

SELECT max_downstream_throughput___mbit_s__ FROM table_2394927_1 WHERE profile = "8b"