While AMD's Radeon Fury X flagship should be available on June 24th, according to our sources, the rest of the AMD Radeon 300 series lineup should be available immediately after launch.
While Radeon Fury X flagship graphics card will be available on June 24th and probably have limited availability due to issues with interposer technology which stacks High Bandwidth Memory next to the GPU, the rest of the Radeon 300 series should be available immediately after the expected launch on June 16th.
In case you missed it earlier, most of the Radeon 300 series lineup, excluding the flagship Radeon Fury lineup, will be based on well known and improved GPUs and is pretty much a rebranded Radeon 200 series lineup, including the Radeon R9 390X, R9 390, R9 380, R7 370 and R7 360 graphics cards. While we still do not have details on how these chips are "improved" earlier reports suggested that we will just see a minor clock bump.
AMD still did not finalize the price but you can expect the lineup to be similarly priced to the Radeon 200 series, in order for AMD to compete with Nvidia.
There will be plenty of new graphics cards to choose from and some partners will even use new cooling solutions on the Radeon 300 series, so it will be quite interesting.
Source: