In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 550M 2GB are significantly better than the Nvidia NVS 5100M.

The GT 550M was released less than a year after the NVS 5100M, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The GT 550M has 1024 MB more video memory than the NVS 5100M, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the GT 550M also has superior memory performance overall.

The GT 550M has 3.2 GB/sec greater memory bandwidth than the NVS 5100M, which means that the memory performance of the GT 550M is marginally better than the NVS 5100M.

The GeForce GT 550M 2GB has 96 Shader Processing Units and the NVS 5100M has 48. However, the actual shader performance of the GT 550M is 142 and the actual shader performance of the NVS 5100M is 26. The GT 550M having 116 better shader performance and an altogether better performance when taking into account other relevant data means that the GT 550M delivers a slightly smoother and more efficient experience when processing graphical data than the NVS 5100M.

The GeForce GT 550M 2GB requires 35 Watts to run and the NVS 5100M requires 35 Watts. The two GPUs require the same amount of wattage to run. As such, there is no need to worry about which will more significantly affect your yearly electricity bills.