This CPU was taken from a working computer.It is tested and works perfectly. Reference #s 01255, 02091, 00728, 01130, 02208, 01223, 00239, 01008, 00057, 00410, 05787, 03581, 00419, 00256, 01844, 02366, 02656, 01667, 03647, 00334, 01747, 02801, 04719, 00829, 04437, 00399, 04638, 00249, 00340, 02031, 01409, 02018, 05165, 02767, 00474, 02015.