The 5850 isn't that large unlike some 5830s and the well known 5970. The largest card that I have ever tried to use was the massive 7900gts duo which was the same size as the 5970. 9.5in cards are typically aren't to long for most cases like the 9800gt standard or the 3870 as examples. The cards that really made people worry was the 8800gtx and the 4850x2. So if you really want to know is look up the sizes of the cards and make cardboard cutouts matching their physical dimensions such as length and height.