I wouldn't be surprised if some video cards were designed with orientation in mind for cooling as well. I have an Aerocool Coolview and the only problem with it is that the place I have for it to sit is on the left side of my desk so I have to turn it around or move it to monkey around inside. That may be enough for me to go back to my R5604 when I get my Hitachi 7K160 RMA replacement (was DOA). I'm hoping for early next week.
.bh.