CREATE TABLE table_26907 ("Codename  ( main article ) " CLOB, "Brand name  ( list ) " CLOB, "Cores" FLOAT, "L3 Cache" CLOB, "Socket" CLOB, "TDP" CLOB, "I/O Bus" CLOB)

What is the i/o bus for the brand name Core i3-21xx?
SELECT "I/O Bus" FROM table_26907 WHERE "Brand name (list)" = 'Core i3-21xx'
SELECT "I/O Bus" FROM "table_26907" WHERE "Brand name (list)" = 'Core i3-21xx'