user: Question: What is the l2 cache for the model with a release price of $669?
Columns: ['Model number', 'sSpec number', 'Frequency', 'L2 cache', 'FSB', 'Mult.', 'Voltage', 'TDP', 'Socket', 'Release date', 'Part number(s)', 'Release price ( USD )']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Pentium III 450', 'SL364(kB0)SL38E(kB0)SL3CC(kB0)SL35D(kC0)SL37C(kC0)', '450 MHz', '512 KB', '100 MT/s', '4.5×', '1.93–2.07V', '33.76 W', 'Slot 1', 'February 26, 1999', '80525PY450512BX80525U450512BX80525U450512E', '$496']
SQL:

assistant: SELECT "L2 cache" FROM "Table" WHERE "Release price ( USD )" = '$669';