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

The 4 MX was released over three years more recently than the Riva TNT, and so the 4 MX is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the Riva TNT when running the latest games.

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 112 MB more video memory than the Riva TNT, 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 1.4 GB/sec greater memory bandwidth than the Riva TNT, which means that the memory performance of the 4 MX is marginally better than the Riva TNT.

Both the Riva TNT 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 TNT 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.