How much are you paying for it? It generally wouldn't be a good gaming system at all. At similar price you could get much better one, because APUs are generally expensive for their performance when it comes to gaming.
Also, could you take some picture of inside the PC when the side is taken off? There are few different versions of the card, and I'm sure you want to get a compatible one . Upload the pictures to www.imageshack.us
I'd need to see whole case for its size and the power supply info, which is a label on a box that looks like this: