CREATE TABLE table_12740151_8 (price___usd__ VARCHAR, l3 VARCHAR)

What's the price (in USD) of the model whose L3 is 18 mb?
SELECT price___usd__ FROM table_12740151_8 WHERE l3 = "18 MB"
SELECT "price___usd__" FROM "table_12740151_8" WHERE "18 MB" = "l3"