CREATE TABLE table_51061 ("Model number" TEXT, "sSpec number" TEXT, "Frequency" TEXT, "GPU frequency" TEXT, "L2 cache" TEXT, "I/O bus" TEXT, "Memory" TEXT, "Socket" TEXT, "Release date" TEXT, "Part number ( s ) " TEXT)

What is Model Number, when Part Number(s) is AY80609003987AB?
SELECT "Model number" FROM table_51061 WHERE "Part number(s)" = 'ay80609003987ab'
SELECT "Model number" FROM "table_51061" WHERE "Part number(s)" = 'ay80609003987ab'