In terms of overall gaming performance, the graphical capabilities of the Nvidia Quadro 4000M are significantly better than the Nvidia GeForce GT 550M 2GB.

The Quadro 4000M was released less than a year after the GT 550M, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The GeForce GT 550M 2GB and the Quadro 4000M have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The Quadro 4000M has 124.8 GB/sec greater memory bandwidth than the GT 550M, which means that the memory performance of the Quadro 4000M is massively better than the GT 550M.

The GeForce GT 550M 2GB has 96 Shader Processing Units and the Quadro 4000M has 336. However, the actual shader performance of the GT 550M is 142 and the actual shader performance of the Quadro 4000M is 160. The Quadro 4000M having 18 better shader performance and an altogether better performance when taking into account other relevant data means that the Quadro 4000M delivers a massively smoother and more efficient experience when processing graphical data than the GT 550M.

The GeForce GT 550M 2GB requires 35 Watts to run and the Quadro 4000M requires 100 Watts. The Quadro 4000M requires 65 Watts more than the GT 550M to run. The difference is significant enough that the Quadro 4000M may have an adverse affect on your yearly electricity bills in comparison to the GT 550M.