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_3725 ( "Model Number" text, "Frequency" text, "L2 Cache" text, "HT" text, "Mult. 1" text, "Voltage" text, "TDP" text, "Socket" text, "Release date" text, "Order Part Number" text )

### Question ###
What kind of sockets does a 2100MHz Athlon X2 QL-64 use?

### Accurate SQL ###

SELECT "Socket" FROM table_3725 WHERE "Frequency" = '2100MHz' AND "Model Number" = 'Athlon X2 QL-64'