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)

What kind of sockets does a 2100MHz Athlon X2 QL-64 use?
SELECT "Socket" FROM table_3725 WHERE "Frequency" = '2100MHz' AND "Model Number" = 'Athlon X2 QL-64'
SELECT "Socket" FROM "table_3725" WHERE "Frequency" = '2100MHz' AND "Model Number" = 'Athlon X2 QL-64'