In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 940MX 2GB are massively better than the AMD Radeon HD 6520G.

The GeForce 940MX 2GB has a 722 MHz higher core clock speed and 8 more Texture Mapping Units than the Radeon HD 6520G. This results in the GeForce 940MX 2GB providing 20.5 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 722 MHz higher core clock speed than the Radeon HD 6520G and the same number of Render Output Units. This results in the GeForce 940MX 2GB providing 5.8 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 Radeon HD 6520G, 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 Radeon HD 6520G when running the latest games.

The GeForce 940MX 2GB has 2048 MB video memory, but the Radeon HD 6520G does not have an entry, so the two GPUs cannot be reliably compared in this area.

The GeForce 940MX 2GB has 384 Shader Processing Units and the Radeon HD 6520G has 320. However, the actual shader performance of the GeForce 940MX 2GB is 644 and the actual shader performance of the Radeon HD 6520G is 83. The GeForce 940MX 2GB having 561 better shader performance and an altogether better performance when taking into account other relevant data means that the GeForce 940MX 2GB delivers a significantly smoother and more efficient experience when processing graphical data than the Radeon HD 6520G.

The GeForce 940MX 2GB transistor size technology is 12 nm (nanometers) smaller than the Radeon HD 6520G. This means that the GeForce 940MX 2GB is expected to run slightly cooler and achieve higher clock frequencies than the Radeon HD 6520G.

The GeForce 940MX 2GB requires 25 Watts to run and the Radeon HD 6520G requires 35 Watts. The Radeon HD 6520G requires 10 Watts more than the GeForce 940MX 2GB to run. The difference is not significant enough for the Radeon HD 6520G to have a noticeably larger impact on your yearly electricity bills than the GeForce 940MX 2GB.