It just means that the second GPU is more powerful in handling 2D works as compared to the first one.. By the DB buffering results i am assuming that the onboard GPU unit is having a higher memory frame.. Anyways, its a yes for your question.. The 8600GT will perform better than the onboard 8300 ( in games especially ).. The benchmark is for 2D performance and thus the conclusions can be drawn keeping 2D in mind as the latter will give you a smoother desktop performance..