Apparently overclocking was broken in the review drivers so hopefully that will be sorted out quickly before the AIB cards show up.
I wouldn't rate it based on reference design overclocking after looking at the thermals from that blower cooler
They already have a driver out that fixes the overclocking problem, just didn't make it to the reviewers on time. But, they still that there won't be that much headroom in them.
The problem with the Reference cooler been so poor is that the AIB cards will be that much more expensive.