In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce4 MX 420 are significantly better than the Nvidia GeForce 6150 LE.

The GeForce 6150 LE was released over a year more recently than the GeForce4 MX 420, and so the GeForce 6150 LE is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GeForce4 MX 420.

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 GeForce4 MX 420 has 64 MB video memory, but the GeForce 6150 LE does not have an entry, so the two GPUs cannot be reliably compared in this area.

Both the GeForce 6150 LE and the GeForce4 MX 420 have 2 Shader Processing Units. 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.