While details on AMD's high-end ATI Radeon HD 4870 X2 graphics card began surfacing last month, today this dual-GPU graphics card has formally launched and will begin shipping to retailers. The good news this time around is that this graphics card will actually be something worth looking at under Linux now that there's the needed CrossFire support on the horizon. We're not yet permitted to publish the Linux CrossFire benchmarks, but today we have a few pieces of information to share about the Radeon HD 4870 X2 on Linux.