After covering the launch of AMD's mainstream DirectX 11 graphics boards last week via their new "Juniper" GPU core courtesy of a couple of cards from Sapphire, we already find ourselves ready and raring to revisit the Radeon HD 5770 thanks to a sample from HIS. Again, this board sports both AMD's reference cooling solution and clock speeds, so rather than simply repeating ourselves, how about taking a look at CrossFire performance while running two Radeon HD 5770 parts in tandem to make things a little more exciting?