DX10 on the gma x3100 would be a slideshow (its not so great in DX9 either), it is technially able to "display" DX10 content, but being playable is a completely different story. But since its a laptop, the gma x3100 would have the advantage of using the centrino chipset with a core 2 duo based cpu, while i ve only seen amd chips on the 7150m 's if that matters at all. Perhaps try to look at a laptop that comes with a 8400m or something similar (HP has some nice laptops that can be equipped with the 8400m) which would give you a far better casual gaming experience.