What's the size difference between a GeForce 7900 GT and a GTX460?

Friend of mine just asked me to check online for a graphics card, as he just got himself an old box for next to nothing. Currently the box has a GeForce 7900 on it, and the card that I found which falls within his budget is the GTX460. (if you guys know of better cards in this price range it would be great if you share). The thing is, I don't know what the box looks like, and how much space it has...but based on the fact that a GeForce 7900 fits into it...would a GTX460 fit into it?|||IIRC the 7900 is a single slot card and the GTX 460 is a dual slot card (in terms of height), you'll have to make sure there's no sound card/controller card/ NIC/ etc. currently residing directly under the where the 7900 currently is.|||Well a gtx460 is small it should fit in any case easily in an normal mid-atx tower. same price cards, 6850, and that would be better. that should also fit in any mid atx size case. 6850 could run on a 400-450W psu, gtx460 uses more power, will probably need 500W.