New 8400, XPS gen 3 systems - can your systems play current games (Far Cry...)?

If you have one of these new systems with PCI express, and one of the
new radeon X800 video cards, could you please indicate whether your
system is able to play current games (such as Far Cry, Doom 3, ...),
without crashing, freezing, lock-ups.
There are multiple ongoing threads in the Dell Support Forums by users
complaining how they are unable to play games on their "gaming
computers":

- forums.us.dell.com/supportforums/board?board.id=dim_video
- forums.us.dell.com/supportforums/board?board.id=game-gen

Dell is saying little, and it is not clear at all how prevalent this
problem is.