In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 285M SLI are very slightly better than the AMD Radeon R9 M365X 4GB.

The R9 M365X has a 25 MHz higher core clock speed than the GTX 285M, but the GTX 285M has 88 more Texture Mapping Units than the R9 M365X. As a result, the GTX 285M exhibits a 51.8 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 25 MHz higher core clock speed than the GTX 285M, but the GTX 285M has 16 more Render Output Units than the R9 M365X. As a result, the GTX 285M exhibits a 9.2 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 GTX 285M, 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 GTX 285M when running the latest games.

The R9 M365X has 2048 MB more video memory than the GTX 285M, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the GTX 285M has superior memory performance.

The GTX 285M has 1.3 GB/sec greater memory bandwidth than the R9 M365X, which means that the memory performance of the GTX 285M is marginally better than the R9 M365X.

The Radeon R9 M365X 4GB has 640 Shader Processing Units and the GeForce GTX 285M SLI has 256. However, the actual shader performance of the R9 M365X is 340 and the actual shader performance of the GTX 285M is 154. The R9 M365X having 186 better shader performance is not particularly notable, as altogether the GTX 285M performs better when taking into account other relevant data.

The R9 M365X transistor size technology is 27 nm (nanometers) smaller than the GTX 285M. This means that the R9 M365X is expected to run slightly cooler and achieve higher clock frequencies than the GTX 285M. While they exhibit similar graphical performance, the R9 M365X should consume less power than the GTX 285M.

The Radeon R9 M365X 4GB requires 50 Watts to run and the GeForce GTX 285M SLI requires 150 Watts. The GTX 285M requires 100 Watts more than the R9 M365X 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 R9 M365X.