user: Question: Which Model number has a Frequency of 2000MHz and a Voltage of 0.75-1.2?
Columns: ['Model number', 'Frequency', 'L2 cache', 'Multi 1', 'Voltage', 'Socket', 'Release date', 'Order part number']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Turion X2 Ultra ZM-80', '2100MHz', '2 x 1 MB', '10.5x', '0.75-1.2', 'g Socket S1 2', 'June 4, 2008', 'TMZM80DAM23GG']
SQL:

assistant: SELECT "Model number" FROM "Table" WHERE "Frequency" = '2000MHz' AND "Voltage" = '0.75-1.2';