Both are single core, including that NVIDIA. There is no such a thing like 32 core GPU.
i5-650 is a duel core processor.
The features of the graphic depend on which unit you have. This link gives a good idea of many of the Intel graphic controlers. http://en.wikipedia.org/wiki/Intel_HD_Graphics#HD_Graphics_.28GMA_HD.29
The Nvidia card was revied here http://reviews.cnet.com/graphics-cards/msi-nx8400gs-td512e-graphics/4505-8902_7-32825315.html
if you would like more info on that card.