The flagship device, the Radeon R9 Fury X, was released on June 24, 2015, with the dual-GPU variant, the Radeon Pro Duo, being released on April 26, 2016. The Radeon 300 series cards including the R9 390X were released on June 18, 2015. However, the remaining GPUs in the series outside the Tonga based R9 380 and R9 380X are based on previous generation GPUs with revised power management, and therefore only feature GDDR5 memory (something Tonga does as well). HBM is faster and more power efficient than GDDR5 memory, though also more expensive. Some of the cards in the series include the Fiji based flagship AMD Radeon R9 Fury X, cut-down Radeon R9 Fury and small form factor Radeon R9 Nano, which are the first GPUs to feature High Bandwidth Memory (HBM) technology, which AMD co-developed in partnership with SK Hynix. The series includes the Fiji and Tonga GPU dies based on AMD's GCN 3 or "Volcanic Islands" architecture, which had originally been introduced with the Tonga based (though cut-down) R9 285 slightly earlier. All of the GPUs of the series are produced in 28 nm format and use the Graphics Core Next (GCN) micro-architecture. The Radeon R5/R7/R9 300 series is a series of Radeon graphics cards made by Advanced Micro Devices (AMD). Vulkan 1.2 (GCN 2nd gen and newer) or Vulkan 1.0 (GCN 1st gen)
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