In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 940MX 2GB are massively better than the Nvidia GeForce GT 220M.

The GeForce 940MX 2GB has a 622 MHz higher core clock speed and 8 more Texture Mapping Units than the GeForce GT 220M. This results in the GeForce 940MX 2GB providing 18.9 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 940MX 2GB has a 622 MHz higher core clock speed than the GeForce GT 220M and the same number of Render Output Units. This results in the GeForce 940MX 2GB providing 5 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 940MX 2GB was released over three years more recently than the GeForce GT 220M, 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 GeForce GT 220M when running the latest games.

The GeForce 940MX 2GB has 1024 MB more video memory than the GeForce GT 220M, so is likely to be much better at displaying game textures at higher resolutions. However, the overall memory performance is about the same.

The GeForce GT 220M has 9.6 GB/sec greater memory bandwidth than the GeForce 940MX 2GB, which means that the memory performance of the GeForce GT 220M is marginally better than the GeForce 940MX 2GB.

The GeForce 940MX 2GB has 384 Shader Processing Units and the GeForce GT 220M has 32. However, the actual shader performance of the GeForce 940MX 2GB is 644 and the actual shader performance of the GeForce GT 220M is 40. The GeForce 940MX 2GB having 604 better shader performance and an altogether better performance when taking into account other relevant data means that the GeForce 940MX 2GB delivers a noticeably smoother and more efficient experience when processing graphical data than the GeForce GT 220M.

The GeForce 940MX 2GB transistor size technology is 27 nm (nanometers) smaller than the GeForce GT 220M. This means that the GeForce 940MX 2GB is expected to run slightly cooler and achieve higher clock frequencies than the GeForce GT 220M.

The GeForce 940MX 2GB requires 25 Watts to run and the GeForce GT 220M requires 14 Watts. The GeForce 940MX 2GB requires 11 Watts more than the GeForce GT 220M to run. The difference is not significant enough for the GeForce 940MX 2GB to have a noticeably larger impact on your yearly electricity bills than the GeForce GT 220M.