Low fps on most games

Hey i just got a toshiba satellite P875-S7310 with a intel hd graphics 4000 and for the first couple of days i thought it was absolutely wonderful. i started downloading some games from steam such as skyrim and fallout new vegas. they ran pretty slow so i managed ways to get better fps to where it would no longer bother me from low fps. but recently i bought far cry 3 and the fps was less than decent. i tried to lower the settings to get it up higher but with all of the settings on low and my resolution at 800x400, which is very far from the native resolution. im really getting tired of this problem and ive been contemplating several ways that i van fix it. the first idea was that maybe if i get more ram it might help (i already have 8gb ddr3-1600 so that has little hope) my next idea was to buy myself a small ssd and ghost my operating system and my most played games to it. the option that i was thinking of next was to just try to maybe buy a motherboard from the upgraded Toshiba Satellite P875-30E and replace it with the one that im currently using. i found that one pretty unreasonable so i was looking around on various websites and i found something pretty interesting. this was that one guy found out how to attach an external graphics card to the laptop, heres the link: http://www.notebookreview.com/default.asp?newsID=5846&r... .. will this work?? if not whats my best option from here im willing to hear any suggestions so anybody please help.