In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 755M are noticeably better than the AMD Radeon HD 8850M.

The GeForce GT 755M has a 355 MHz higher core clock speed but 8 fewer Texture Mapping Units than the Radeon HD 8850M. The lower TMU count doesn't matter, though, as altogether the GeForce GT 755M manages to provide 6.4 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 GeForce GT 755M has a 355 MHz higher core clock speed than the Radeon HD 8850M and the same number of Render Output Units. This results in the GeForce GT 755M providing 5.7 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 GeForce GT 755M was released less than a year after the Radeon HD 8850M, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The Radeon HD 8850M and the GeForce GT 755M have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The GeForce GT 755M has 54.4 GB/sec greater memory bandwidth than the Radeon HD 8850M, which means that the memory performance of the GeForce GT 755M is much better than the Radeon HD 8850M.

The Radeon HD 8850M has 640 Shader Processing Units and the GeForce GT 755M has 384. However, the actual shader performance of the Radeon HD 8850M is 496 and the actual shader performance of the GeForce GT 755M is 376. The Radeon HD 8850M having 120 better shader performance is not particularly notable, as altogether the GeForce GT 755M performs better when taking into account other relevant data.

The Radeon HD 8850M requires 45 Watts to run and the GeForce GT 755M requires 50 Watts. The GeForce GT 755M requires 5 Watts more than the Radeon HD 8850M to run. The difference is not significant enough for the GeForce GT 755M to have a noticeably larger impact on your yearly electricity bills than the Radeon HD 8850M.