In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 950M 2GB are significantly better than the AMD Radeon R9 M365X 4GB.

The GTX 950M has a 289 MHz higher core clock speed and the same number of Texture Mapping Units as the R9 M365X. This results in the GTX 950M providing 11.6 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 GTX 950M has a 289 MHz higher core clock speed than the R9 M365X and the same number of Render Output Units. This results in the GTX 950M providing 4.6 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 R9 M365X was released less than a year after the GTX 950M, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The R9 M365X has 2048 MB more video memory than the GTX 950M, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the GTX 950M has superior memory performance.

The GTX 950M has 16 GB/sec greater memory bandwidth than the R9 M365X, which means that the memory performance of the GTX 950M is slightly better than the R9 M365X.

Both the Radeon R9 M365X 4GB and the GeForce GTX 950M 2GB have 640 Shader Processing Units. While the two GPUs have the same number of SPUs, the actual performance delivered by the GTX 950M is 858 and by the R9 M365X is 858. Knowing that the shader performance of the GTX 950M is superior, it is not necessary to examine the GPUs' respective Texture and Pixel Fill Rates.

The Radeon R9 M365X 4GB requires 50 Watts to run and the GeForce GTX 950M 2GB requires 50 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.