It’s been nearly a year now since Lenovo first announced the unique P50 and P70 mobile workstations,which were 15-inch and 17-inch notebooks, respectively. The part of the announcement which likely caused the most buzz was that Intel was now going to offer their professional Xeon parts in a laptop, and with the launch of the Xeon E3-1500M v5 chip. preceding to this,mobile workstations would only have the option of a consumer level processor, excluding the ability to have ECC memory, and which is a staple in desktop workstations.
Source: anandtech.com