CREATE TABLE table_21017 ("Model number" CLOB, "sSpec number" CLOB, "Frequency" CLOB, "L2 cache" CLOB, "FSB" CLOB, "Mult." CLOB, "Voltage" CLOB, "TDP" CLOB, "Socket" CLOB, "Release date" CLOB, "Part number ( s ) " CLOB, "Release price  (  USD  ) " CLOB)

Name the fsb for atom z540
SELECT "FSB" FROM table_21017 WHERE "Model number" = 'Atom Z540'
SELECT "FSB" FROM "table_21017" WHERE "Model number" = 'Atom Z540'