Ati hd amd 4200 support pixel shader and could it play pes2010 or nfs shift ?

AMD 4200? That sounds like an integrated video from the motherboard? Can you specify what motherboard it is?

And well, features aren't everything. The more important question is, how fast is it?

That card is pretty weak to run games. I would suggest u to grab a ati radeon 4850 which will be plenty for u to game at maximum settings.

If u r a hardcore gamer (play most of the games in the market) with high resolution like 1920(24inch or higher monitor) and want to be a bit more future proof then wait and grab a 5850 as soon as it hits the market. But if u r in a budget but also can wait till christmas u can also grab a 5770 or even 5750 which will be great for gaming at high resolutions. If u r not that much a hardcore gamer and play in medium or low resolution a simple 4850 can do the job at only $100. So its up2u. If u can wait till december u may grab a good gfx with dx11 support.