I have an HP Pavilion Slimline 400
This is the link to the specific computer:
HP Pavilion Slimline 400
I am currently playing The Sims 3 on it. I understand that this is not the optimal computer to be playing this type of game on, but it's worked fine up until the most recent expansions packs. I need help finding a graphics card (and potentially power supply) that would be compatible for this computer and it's size.