In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 2 MX 64MB are noticeably better than the Intel 865G.

The 865G was released over a year more recently than the 2 MX, and so the 865G is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the 2 MX.

Both GPUs exhibit very poor performance, so rather than upgrading from one to the other you should consider looking at more powerful GPUs. Neither of these will be able to run the latest games in any playable way.

The 2 MX has 48 MB more video memory than the 865G, so is likely to be slightly better at displaying game textures at higher resolutions. This is supported by the fact that the 2 MX also has superior memory performance overall.

The 2 MX has 2.7 GB/sec greater memory bandwidth than the 865G, which means that the memory performance of the 2 MX is marginally better than the 865G.

The 865G has 0 Shader Processing Units and the GeForce 2 MX 64MB has 2. The two GPUs are based on different architectures, but deliver an equivalent shader performance. To compare, we must continue to look at the memory bandwidth, Texture and Pixel Rates. In this case, we sadly do not have enough data in this area to complete the comparison.

The 865G requires 13 Watts to run and the GeForce 2 MX 64MB requires 4 Watts. The 865G requires 9 Watts more than the 2 MX to run. The difference is not significant enough for the 865G to have a noticeably larger impact on your yearly electricity bills than the 2 MX.