Haha, sandwiched gave me a picture of how they will be, so +1 for that
. Thanks for telling me about the cooling bonus.
They are both 2 slot solutions so they fitting will be fine just the same. I would go with the Vapor-x certainly so +1 to big. If you look at the two you get a bit more ventilation with the vapor-x which any extra cooling bonus you can get with a crossfire setup take it because unless you have a bridge is long they will be sandwiched either way.