So i have this old laptop that used to run xp... celeron M 520, 1gb ram, 80gb HDD, GMA 945 graphics. me and my friend decided to upgrade it and make it a windows 10 capable machine, so we swapped the CPU with a core duo T2300E and gave it a 500GB hdd, and 2gb ram. Only problem is is that it can only handle Half life 2 lowest settings, barely keeping it above 40fps. Now, in the upgrading process, i spotted a bunch of contacts that have a very similar arrangement as the familiar desktop PCI-X16 slot. I was wondering and my friend too, can't we give it just a mobility radeon hd 5650 or something? i have a crappy old Core 2 duo macbook and i really need something that can handle light gaming(like garry's mod, hl2, l4d2, etc) and runs windows. Any help? I'll send pictures if any of you guys need some.