CREATE TABLE table_16400024_1 (l2_cache VARCHAR2, release_price___usd__ VARCHAR2)

What is the l2 cache for the model with a release price of $669?
SELECT l2_cache FROM table_16400024_1 WHERE release_price___usd__ = "$669"
SELECT "l2_cache" FROM "table_16400024_1" WHERE "$669" = "release_price___usd__"