I came here to mention the front support bracket. You'll find it on the larger AMD workstation cards more often than others, I first remember it on a FirePro reference card, and some searching turned up examples of it for the AMD FirePro V7900, and a few other models.
I've also had the vertical clearance issue since I try to rack mount all my gear now I've got a soundproof rack, its very annoying to need more than 4U of space just to fit a video card in a stable vertical orientation.
I've also had the vertical clearance issue since I try to rack mount all my gear now I've got a soundproof rack, its very annoying to need more than 4U of space just to fit a video card in a stable vertical orientation.