user: Question: What is the voltage when the L2 cache is 2 × 256 KB and the turbo is 5/8?
Columns: ['Model number', 'sSpec number', 'Frequency', 'Turbo', 'GPU frequency', 'Cores', 'L2 cache', 'L3 cache', 'I/O bus', 'Mult.', 'Memory', 'Voltage', 'Socket', 'Release date', 'Part number(s)', 'Release price ( USD )']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power', 'standard power']
SQL:

assistant: SELECT "Voltage" FROM "Table" WHERE "L2 cache" = '2 × 256 KB' AND "Turbo" = '5/8';