I have an 8400, and it is extremely poor with games, it might handle bioshock on low, at low resolution, but its hard to know. The main problem with these machines is that they are not aimed at gamers at all. They are based at people who want a webbox and little else.
They do have a warrantee, so if you are very unconfident, that may be a reason to go for one.
They do have a warrantee, so if you are very unconfident, that may be a reason to go for one.