In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 4 MX 440 are massively better than the Nvidia Riva TNT2.

The 4 MX was released over a year more recently than the Riva TNT2, and so the 4 MX is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the Riva TNT2.

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 4 MX has 96 MB more video memory than the Riva TNT2, so is likely to be slightly better at displaying game textures at higher resolutions. This is supported by the fact that the 4 MX also has superior memory performance overall.

The 4 MX has 0.8 GB/sec greater memory bandwidth than the Riva TNT2, which means that the memory performance of the 4 MX is marginally better than the Riva TNT2.

Both the Riva TNT2 and the GeForce 4 MX 440 have 2 Shader Processing Units. While the two GPUs have the same number of SPUs, the actual performance delivered by the 4 MX is 1 and by the Riva TNT2 is 1. Knowing that the shader performance of the 4 MX is superior, it is not necessary to examine the GPUs' respective Texture and Pixel Fill Rates.