In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 765M are marginally better than the AMD Radeon HD 6990M.

The GeForce GTX 765M has a 135 MHz higher core clock speed and 8 more Texture Mapping Units than the Radeon HD 6990M. This results in the GeForce GTX 765M providing 14.4 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 GTX 765M has a 135 MHz higher core clock speed than the Radeon HD 6990M, but the Radeon HD 6990M has 16 more Render Output Units than the GeForce GTX 765M. As a result, the Radeon HD 6990M exhibits a 9.3 GPixel/s better Pixel Fill Rate than the GeForce GTX 765M. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GeForce GTX 765M was released over a year more recently than the Radeon HD 6990M, and so the GeForce GTX 765M is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the Radeon HD 6990M.

The GeForce GTX 765M and the Radeon HD 6990M have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The Radeon HD 6990M has 51.1 GB/sec greater memory bandwidth than the GeForce GTX 765M, which means that the memory performance of the Radeon HD 6990M is much better than the GeForce GTX 765M.

The GeForce GTX 765M has 768 Shader Processing Units and the Radeon HD 6990M has 1120. However, the actual shader performance of the GeForce GTX 765M is 653 and the actual shader performance of the Radeon HD 6990M is 400. The GeForce GTX 765M having 253 better shader performance is not particularly notable, as altogether the Radeon HD 6990M performs better when taking into account other relevant data.

The GeForce GTX 765M transistor size technology is 12 nm (nanometers) smaller than the Radeon HD 6990M. This means that the GeForce GTX 765M is expected to run slightly cooler and achieve higher clock frequencies than the Radeon HD 6990M. While they exhibit similar graphical performance, the GeForce GTX 765M should consume less power than the Radeon HD 6990M.

The GeForce GTX 765M requires 65 Watts to run and the Radeon HD 6990M requires 100 Watts. The Radeon HD 6990M requires 35 Watts more than the GeForce GTX 765M to run. The difference is significant enough that the Radeon HD 6990M may have a slight adverse affect on your yearly electricity bills in comparison to the GeForce GTX 765M.