In terms of overall gaming performance, the graphical capabilities of the Intel 865G are massively better than the Intel GFX 3840x2160.

The GFX 3840x2160 has no core clock speed set, so any comparison between Texture and Pixel Fill Rates is not currently possible.

The 865G was released over three years more recently than the GFX 3840x2160, and so the 865G is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the GFX 3840x2160 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 865G has 16 MB video memory, but the GFX 3840x2160 does not have an entry, so the two GPUs cannot be reliably compared in this area.

Both the GFX 3840x2160 and the 865G have 0 Shader Processing Units. 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.

The 865G requires 13 Watts to run but there is no entry for the GFX 3840x2160.