CREATE TABLE table_7399 ("Model number" TEXT, "Frequency" TEXT, "L2 cache" TEXT, "Multi 1" TEXT, "Voltage" TEXT, "Socket" TEXT, "Release date" TEXT, "Order part number" TEXT)

Which Model number has a Frequency of 2000mhz and a Voltage of 0.75-1.2?
SELECT "Model number" FROM table_7399 WHERE "Frequency" = '2000mhz' AND "Voltage" = '0.75-1.2'
SELECT "Model number" FROM "table_7399" WHERE "Frequency" = '2000mhz' AND "Voltage" = '0.75-1.2'