What people are saying in the reviews is that you can't go over specific powerdraw which is about ~+30%(up to 250W). So the card can't go past 1200Mhz-1300Mhz depending on load. GPU boost seems to look tricky shuffle between temperature, voltage and coreclock. GPU boost impossible to disable?... hope not. Memory clock isn't changed.

Hopefully MSI/ASUS will release their custom cooler cards with 6+8 pin : )