Different sockets has different features
BGA house http://ark.intel.com/products/65708
rPGA housing http://ark.intel.com/products/67355
Compare chart: http://ark.intel.com/compare/67355,65708
VT-d seems cool feature for me especially for graphics visualization.
I am buying new laptop and I would like to know if processor supports this feature.
I think it is this laptop, but i am not sure: