user: Question: Name the fsb for Atom Z540
Columns: ['Model number', 'sSpec number', 'Frequency', 'L2 cache', 'FSB', 'Mult.', 'Voltage', 'TDP', 'Socket', 'Release date', 'Part number(s)', 'Release price ( USD )']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Atom Z500', 'SLB6Q(C0)', '800 MHz', '512 KB', '400 MT/s', '8×', '0.712–1.1V', '0.65 W', 'BGA 441', 'April 2, 2008', 'AC80566UC800DE', '$45']
SQL:

assistant: SELECT "FSB" FROM "Table" WHERE "Model number" = 'Atom Z540';