In terms of overall gaming performance, the graphical capabilities of the AMD Radeon 9550 are massively better than the Nvidia GeForce 6150 SE 256MB.

The 6150 SE was released over a year more recently than the Radeon 9550, and so the 6150 SE is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the Radeon 9550.

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 GeForce 6150 SE 256MB and the Radeon 9550 have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The Radeon 9550 has 3.2 GB/sec greater memory bandwidth than the 6150 SE, which means that the memory performance of the Radeon 9550 is marginally better than the 6150 SE.

The GeForce 6150 SE 256MB has 2 Shader Processing Units and the Radeon 9550 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.