CREATE TABLE table_66142 ("Model number" TEXT, "sSpec number" TEXT, "Cores" TEXT, "Frequency" TEXT, "Turbo" TEXT, "L2 cache" TEXT, "L3 cache" TEXT, "GPU model" TEXT, "GPU frequency" TEXT, "Socket" TEXT, "I/O bus" TEXT, "Release date" TEXT, "Part number ( s ) " TEXT, "Release price  (  USD  ) " TEXT)

What is the I/O bus entry for the processor with a release price of $657?
SELECT "I/O bus" FROM table_66142 WHERE "Release price ( USD )" = '$657'
SELECT "I/O bus" FROM "table_66142" WHERE "Release price ( USD )" = '$657'