AMD fanboys

Sorry, should of added that it is a pcie solt and he thinks that its only a 300w psu... Seems a little low but how can we confirm this? Do we have to take the case off or will the box tell us? (It's buried in the attic somewhere...) From when I built my PC a few years ago I still have a few power cables left so that shouldn't be an issue if it does need power.
Links look good mate
