Originally Posted by Vardant
What about Asus ROG Ares? Or Asus Mars? There should be others, but I can't remember. The point is, you can go over 300W, if you don't care about PCI-SIG compliance.
Limited edition cards in rare quantity. This is different from a model that you want to be on shelves everywhere.
I don't know all the specifics, but apparently it's an obstacle, otherwise we would've seen cards exceed this power limit already. And ATI wouldn't have done what they did with 5970 by downclocking the 5870 GPUs to slide in under the 300w limit.