hello i have a acer travelmate p243 laptop its a core i5 2450m and has 4 gb ddr3 1333 mhz ram can any expert guys can tell me if i can add a graphics card in it actually i have a spare gt 640m 2 gb ddr3 laptop graphics card in my hand i found it from my dead laptop but the card works so can i insert it on that lappy can any expert fellow can tell me how i can do it