In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 6150 SE 256MB are significantly better than the AMD Radeon X1200 128mb.

The Radeon X1200 128mb was released less than a year after the 6150 SE, and so they are likely to have similar driver support for optimizing performance 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 6150 SE has 128 MB more video memory than the Radeon X1200 128mb, so is likely to be slightly better at displaying game textures at higher resolutions. This is supported by the fact that the 6150 SE also has superior memory performance overall.

The memory bandwidth of the GeForce 6150 SE 256MB and the Radeon X1200 128mb are the same, which means the 6150 SE and the Radeon X1200 128mb have equal limitations when it comes to graphical data transfer.

The GeForce 6150 SE 256MB has 2 Shader Processing Units and the Radeon X1200 128mb has 4. 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.