CREATE TABLE table_24538587_11 (i_o_bus VARCHAR, brand_name__list_ VARCHAR, socket VARCHAR, codename__main_article_ VARCHAR)
What i/o buses are associated with the LGA 1155 socket, a code name of Sandy Bridge (desktop) and a brand name of Core i3-21xx?
SELECT i_o_bus FROM table_24538587_11 WHERE socket = "LGA 1155" AND codename__main_article_ = "Sandy Bridge (Desktop)" AND brand_name__list_ = "Core i3-21xx"