9 in x 15.5 in x 21.5 in ... doesn't really matter if H is 9 or W is 9 or D is 9 as long as the other fit in the other two dimensions. Yeah it might matter on the placement of things inside the box.
Did the OP post this here too? http://www.tomshardware.com/answers/...-atx-case.html
How about? http://www.silverstonetek.com/produc...id=233&area=en
If I did the conversions right I think it works. Not sure with that video card though.