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_87 (gpu_frequency VARCHAR, cores VARCHAR)

### Question ###
What's the GPU frequency that has ultra-low power in cores?

### Accurate SQL ###

SELECT gpu_frequency FROM table_name_87 WHERE cores = "ultra-low power"