In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 4 MX 440 are marginally better than the Nvidia GeForce 9300.

The GeForce 9300 was released over three years more recently than the 4 MX, and so the GeForce 9300 is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the 4 MX 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 128 MB video memory, but the GeForce 9300 does not have an entry, so the two GPUs cannot be reliably compared in this area.

The GeForce 9300 has 16 Shader Processing Units and the GeForce 4 MX 440 has 2. However, the actual shader performance of the GeForce 9300 is 7 and the actual shader performance of the 4 MX is 1. The GeForce 9300 having 6 better shader performance and an altogether better performance when taking into account other relevant data means that the GeForce 9300 delivers a marginally smoother and more efficient experience when processing graphical data than the 4 MX.