In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 550M 2GB are very slightly better than the Nvidia GeForce GT 635M v2.

The GT 550M has a 80 MHz higher core clock speed and the same number of Texture Mapping Units as the GT 635M. This results in the GT 550M providing 1.2 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GT 550M has a 80 MHz higher core clock speed than the GT 635M and the same number of Render Output Units. This results in the GT 550M providing 0.4 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GT 635M was released over a year more recently than the GT 550M, and so the GT 635M is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GT 550M.

The GT 550M has 1024 MB more video memory than the GT 635M, 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 memory bandwidth of the GeForce GT 635M v2 and the GeForce GT 550M 2GB are the same, which means the GT 635M and the GT 550M have equal limitations when it comes to graphical data transfer.

Both the GeForce GT 635M v2 and the GeForce GT 550M 2GB have 96 Shader Processing Units. Having the same number of SPUs and using the same architecture means that the performance they offer can be compared by looking at the memory bandwidth, Texture and Pixel Rates. In this case, the GT 550M has 1.2 GTexel/s better Texture Fill Rate and 0.4 GPixel/s better Pixel Fill Rate, but the has GB/sec greater memory bandwidth. Although the GPUs are very similar in performance, the GT 550M takes the edge.

The GeForce GT 635M v2 requires 33 Watts to run and the GeForce GT 550M 2GB requires 35 Watts. The GT 550M requires 2 Watts more than the GT 635M to run. The difference is not significant enough for the GT 550M to have a noticeably larger impact on your yearly electricity bills than the GT 635M.