user: Question: What kind of sockets does a 2100MHz Athlon X2 QL-64 use?
Columns: ['Model Number', 'Frequency', 'L2 Cache', 'HT', 'Mult. 1', 'Voltage', 'TDP', 'Socket', 'Release date', 'Order Part Number']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Athlon X2 QL-60', '1900MHz', '2 × 512kB', '1800MHz', '0 9.5x', '0.95 - 1.1V', '35W', 'Socket S1G2', 'June 4, 2008', 'AMQL60DAM22GG']
SQL:

assistant: SELECT "Socket" FROM "Table" WHERE "Frequency" = '2100MHz' AND "Model Number" = 'Athlon X2 QL-64';