In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 950M 2GB are significantly better than the Nvidia GeForce GT 750M Mac Edition.

The GT 750M has a 12 MHz higher core clock speed than the GTX 950M, but the GTX 950M has 8 more Texture Mapping Units than the GT 750M. As a result, the GTX 950M exhibits a 7 GTexel/s better Texture Fill Rate than the GT 750M. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GT 750M has a 12 MHz higher core clock speed than the GTX 950M and the same number of Render Output Units. This results in the GT 750M providing 0.2 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 GTX 950M was released over a year more recently than the GT 750M, and so the GTX 950M is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GT 750M.

The GeForce GTX 950M 2GB and the GeForce GT 750M Mac Edition have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The GT 750M has 0.2 GB/sec greater memory bandwidth than the GTX 950M, which means that the memory performance of the GT 750M is marginally better than the GTX 950M.

The GeForce GTX 950M 2GB has 640 Shader Processing Units and the GeForce GT 750M Mac Edition has 384. However, the actual shader performance of the GTX 950M is 858 and the actual shader performance of the GT 750M is 356. The GTX 950M having 502 better shader performance and an altogether better performance when taking into account other relevant data means that the GTX 950M delivers a noticeably smoother and more efficient experience when processing graphical data than the GT 750M.

The GeForce GTX 950M 2GB requires 50 Watts to run and the GeForce GT 750M Mac Edition 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.