In terms of overall gaming performance, the graphical capabilities of the Nvidia Quadro FX 2000 are massively better than the Nvidia GeForce 6150 SE 256MB.

The 6150 SE was released over three years more recently than the FX 2000, and so the 6150 SE is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the FX 2000 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 FX 2000, so is likely to be slightly better at displaying game textures at higher resolutions. However, overall, the FX 2000 has superior memory performance.

The FX 2000 has 12.8 GB/sec greater memory bandwidth than the 6150 SE, which means that the memory performance of the FX 2000 is slightly better than the 6150 SE.

The Quadro FX 2000 has 4 Shader Processing Units and the GeForce 6150 SE 256MB has 2. However, the actual shader performance of the FX 2000 is 2 and the actual shader performance of the 6150 SE is 1. The FX 2000 having 1 better shader performance and an altogether better performance when taking into account other relevant data means that the FX 2000 delivers a marginally smoother and more efficient experience when processing graphical data than the 6150 SE.