In terms of overall gaming performance, the graphical capabilities of the Intel GMA 3100 are massively better than the Nvidia GeForce 6150 SE 256MB.

The GMA 3100 was released over a year more recently than the 6150 SE, and so the GMA 3100 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 GMA 3100 and the GeForce 6150 SE 256MB have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The memory bandwidth of the GMA 3100 and the GeForce 6150 SE 256MB are the same, which means the GMA 3100 and the 6150 SE have equal limitations when it comes to graphical data transfer.

The GMA 3100 has 128 Shader Processing Units and the GeForce 6150 SE 256MB has 2. However, the actual shader performance of the GMA 3100 is 51 and the actual shader performance of the 6150 SE is 1. The GMA 3100 having 50 better shader performance and an altogether better performance when taking into account other relevant data means that the GMA 3100 delivers a marginally smoother and more efficient experience when processing graphical data than the 6150 SE.

The GMA 3100 requires 17 Watts to run but there is no entry for the GeForce 6150 SE 256MB.