X1950 is actually stronger than the 4200 onboard for gaming, so that doesn't really matter mate. 4200 discrete cards were rubbish, and the onboard version isn't doing it any favours.
Forget about playing the Witcher 2, unless you want a slide show. SC II will run, but will look quite ugly, esp if you're use to HD console graphics. But it also depends alot on your tolerance. i know some people can game on the pc fine at 20-30 fps. Me on the other hand, can't stand anything under 50 lol.
Overall, the 4200 is probably better though if you plan on watching movies and stuff. But don't think you can complain too much, you did get a good deal for it. So be happy =D
Also slimebeast is correct. The xbox360 is actually faster than his laptop, esp for gaming.
