In terms of overall gaming performance, the graphical capabilities of the Nvidia Quadro4 700 XGL are massively better than the Intel 865G.

The 865G was released over a year more recently than the Quadro4 700 XGL, and so the 865G is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the Quadro4 700 XGL.

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 Quadro4 700 XGL has 48 MB more video memory than the 865G, so is likely to be slightly better at displaying game textures at higher resolutions. This is supported by the fact that the Quadro4 700 XGL also has superior memory performance overall.

The Quadro4 700 XGL has 3.6 GB/sec greater memory bandwidth than the 865G, which means that the memory performance of the Quadro4 700 XGL is marginally better than the 865G.

The Quadro4 700 XGL has 4 Shader Processing Units but the 865G does not have an entry, so the two GPUs cannot be reliably compared in this area.

The 865G requires 13 Watts to run but there is no entry for the Quadro4 700 XGL.