The ThinkPad P series line of laptops is produced by Lenovo and was introduced by the company as a successor to the previous ThinkPad W series. With 15" and 17" screens, the ThinkPad P series saw the reintroduction of physically large laptops into the ThinkPad line. Marketed largely as portable workstations., many P series laptops can be configured with high-end quad-core, hexa-core or octo-core Intel processors as well as ECC memory (only with Xeon Processors) and a discrete Nvidia Quadro GPU. The P series offers ISV certifications from software vendors such as Adobe and Autodesk for various CAD software. The P52 and P72 models are the last current Lenovo laptops with a dedicated magnesium structural frame.