CREATE TABLE table_76818 ("Model Number" TEXT, "Frequency" TEXT, "L2-Cache" TEXT, "Front Side Bus" TEXT, "Multiplier" TEXT, "Voltage" TEXT, "Socket" TEXT, "Release Date" TEXT)

What is the Release Date for Model Number c7 1.8?
SELECT "Release Date" FROM table_76818 WHERE "Model Number" = 'c7 1.8'
SELECT "Release Date" FROM "table_76818" WHERE "Model Number" = 'c7 1.8'