In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 3200 are massively better than the Nvidia GeForce 6150 SE 256MB.

The Radeon HD 3200 was released over a year more recently than the 6150 SE, and so the Radeon HD 3200 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the 6150 SE.

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 6150 SE has 256 MB video memory, but the Radeon HD 3200 does not have an entry, so the two GPUs cannot be reliably compared in this area.

The Radeon HD 3200 has 40 Shader Processing Units and the GeForce 6150 SE 256MB has 2. However, the actual shader performance of the Radeon HD 3200 is 13 and the actual shader performance of the 6150 SE is 1. The Radeon HD 3200 having 12 better shader performance and an altogether better performance when taking into account other relevant data means that the Radeon HD 3200 delivers a marginally smoother and more efficient experience when processing graphical data than the 6150 SE.