HIS R9 270X IceQ X² Turbo Boost 2 GB @ techPowerUp
 

The HIS R9 270X IceQ X² Turbo Boost comes at reference design pricing of $200, which makes it the cheapest, highest-clocked R9 270X available at this time. In addition to the free overclock out of the box, you also get a better cooler that provides very low temperatures, but ends up slightly noisy.

http://www.techpowerup.com/reviews/H...2_Turbo_Boost/