After doing a bit of searching, I'm unsure if it will work with W7/DX 9 or not. Have you checked out this link? http://ati.amd.com/products/radeonigp/rigp340m.html
If you cannot find anything, I'd try and contact ATI to see what they have to say about it. Either that or you can try an install DX9 now to see if it works.