Ok, I figured it wasn't that simple.
...so can I assume that a 9400 would require less power than a 9500? I found another card on Newegg (http://www.newegg.com/Product/Product.aspx?Item=N82E16814121292)
that's a 9400 but it happens to have HDMI out, which I would prefer but not if it ends up using more power or a 9500 is measureable better than a 9400 for video (not gaming). HDMI would be nice but not required.