In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 285M SLI are noticeably better than the Nvidia GeForce 940MX 2GB.

The GeForce 940MX 2GB has a 522 MHz higher core clock speed than the GTX 285M, but the GTX 285M has 104 more Texture Mapping Units than the GeForce 940MX 2GB. As a result, the GTX 285M exhibits a 49.9 GTexel/s better Texture Fill Rate than the GeForce 940MX 2GB. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GeForce 940MX 2GB has a 522 MHz higher core clock speed than the GTX 285M, but the GTX 285M has 24 more Render Output Units than the GeForce 940MX 2GB. As a result, the GTX 285M exhibits a 10.2 GPixel/s better Pixel Fill Rate than the GeForce 940MX 2GB. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GeForce 940MX 2GB was released over three years more recently than the GTX 285M, and so the GeForce 940MX 2GB is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the GTX 285M when running the latest games.

The GeForce 940MX 2GB and the GeForce GTX 285M SLI have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The GTX 285M has 49.3 GB/sec greater memory bandwidth than the GeForce 940MX 2GB, which means that the memory performance of the GTX 285M is noticeably better than the GeForce 940MX 2GB.

The GeForce 940MX 2GB has 384 Shader Processing Units and the GeForce GTX 285M SLI has 256. However, the actual shader performance of the GeForce 940MX 2GB is 644 and the actual shader performance of the GTX 285M is 154. The GeForce 940MX 2GB having 490 better shader performance is not particularly notable, as altogether the GTX 285M performs better when taking into account other relevant data.

The GeForce 940MX 2GB transistor size technology is 27 nm (nanometers) smaller than the GTX 285M. This means that the GeForce 940MX 2GB is expected to run slightly cooler and achieve higher clock frequencies than the GTX 285M.

The GeForce 940MX 2GB requires 25 Watts to run and the GeForce GTX 285M SLI requires 150 Watts. The GTX 285M requires 125 Watts more than the GeForce 940MX 2GB to run. The difference is significant enough that the GTX 285M may have an adverse affect on your yearly electricity bills in comparison to the GeForce 940MX 2GB.