In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce FX 5900 Ultra are massively better than the Nvidia GeForce 4 MX 440.

The FX 5900 was released over a year more recently than the 4 MX, and so the FX 5900 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the 4 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 FX 5900 has 128 MB more video memory than the 4 MX, so is likely to be slightly better at displaying game textures at higher resolutions. This is supported by the fact that the FX 5900 also has superior memory performance overall.

The FX 5900 has 10.4 GB/sec greater memory bandwidth than the 4 MX, which means that the memory performance of the FX 5900 is slightly better than the 4 MX.

The GeForce 4 MX 440 has 2 Shader Processing Units and the GeForce FX 5900 Ultra has 4. However, the actual shader performance of the 4 MX is 1 and the actual shader performance of the FX 5900 is 2. The FX 5900 having 1 better shader performance and an altogether better performance when taking into account other relevant data means that the FX 5900 delivers a marginally smoother and more efficient experience when processing graphical data than the 4 MX.

The GeForce FX 5900 Ultra requires 59 Watts to run but there is no entry for the 4 MX.