CREATE TABLE table_7139 ("Model number" TEXT, "Frequency" TEXT, "L2 cache" TEXT, "Multi 1" TEXT, "Voltage" FLOAT, "Socket" TEXT, "Release date" TEXT, "Order part number" TEXT)

Which model number has an order part number of TMDML44BKX5LD?
SELECT "Model number" FROM table_7139 WHERE "Order part number" = 'tmdml44bkx5ld'
SELECT "Model number" FROM "table_7139" WHERE "Order part number" = 'tmdml44bkx5ld'