CREATE TABLE table_20780 ("Model number" TEXT, "sSpec number" TEXT, "Frequency" TEXT, "L2 cache" TEXT, "FSB" TEXT, "Mult." TEXT, "Voltage" TEXT, "TDP" TEXT, "Socket" TEXT, "Release date" TEXT, "Part number ( s ) " TEXT, "Release price  (  USD  ) " TEXT)

What is the l2 cache for the model with a release price of $669?
SELECT "L2 cache" FROM table_20780 WHERE "Release price ( USD )" = '$669'
SELECT "L2 cache" FROM "table_20780" WHERE "Release price ( USD )" = '$669'