This CPU was pulled from a working Computer. It is tested and works perfectly. Reference #s 9KC3177X00225, 9KM8424S20240, 9JS6328W10144, 9JA5054000218, 9KD3914010464, 9KC5223X00210, 9KB66006W00309, 9KA2514T00224, 9KE9405R10150, 9LS2984W20583, 9JW0008M20235, 9KT9240Q30189, 9KC3824M10271, 9KC3824M10026, 9HZ6780R00291, 9JC4701R00669, 9KE896R10409, Y933789R90170, 9JA9214000304, 9KA1382T00159.