In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 6950M are marginally better than the AMD Radeon R9 M365X 4GB.

The R9 M365X has a 45 MHz higher core clock speed than the Radeon HD 6950M, but the Radeon HD 6950M has 8 more Texture Mapping Units than the R9 M365X. As a result, the Radeon HD 6950M exhibits a 2.8 GTexel/s better Texture Fill Rate than the R9 M365X. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The R9 M365X has a 45 MHz higher core clock speed than the Radeon HD 6950M, but the Radeon HD 6950M has 16 more Render Output Units than the R9 M365X. As a result, the Radeon HD 6950M exhibits a 8.6 GPixel/s better Pixel Fill Rate than the R9 M365X. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The R9 M365X was released over three years more recently than the Radeon HD 6950M, and so the R9 M365X is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the Radeon HD 6950M when running the latest games.

The R9 M365X has 3072 MB more video memory than the Radeon HD 6950M, so is likely to be much better at displaying game textures at higher resolutions. However, the overall memory performance is about the same.

The Radeon HD 6950M has 51.2 GB/sec greater memory bandwidth than the R9 M365X, which means that the memory performance of the Radeon HD 6950M is much better than the R9 M365X.

The Radeon R9 M365X 4GB has 640 Shader Processing Units and the Radeon HD 6950M has 960. However, the actual shader performance of the R9 M365X is 340 and the actual shader performance of the Radeon HD 6950M is 278. The R9 M365X having 62 better shader performance is not particularly notable, as altogether the Radeon HD 6950M performs better when taking into account other relevant data.

The R9 M365X transistor size technology is 12 nm (nanometers) smaller than the Radeon HD 6950M. This means that the R9 M365X is expected to run slightly cooler and achieve higher clock frequencies than the Radeon HD 6950M. While they exhibit similar graphical performance, the R9 M365X should consume less power than the Radeon HD 6950M.

The Radeon R9 M365X 4GB requires 50 Watts to run and the Radeon HD 6950M 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.