I think your sager may have mxm graphics card which can be changed, can you confirm that? If you looked into laptop upgrade you find cpu are easy to find and graphics upgrade are slightly more difficult but the major challenge for laptop is the mobo because they not compatible between models.
mxm gpu: http://www.mxm-upgrade.com/Table_3.html
laptop cpu are easier on newegg
IMO it is not worth upgrading. I rather use it until it is old and buy a new one because no mobo upgrade.