AMD Radeon Rx 300 is brand for a series of graphics cards. All used GPUs have been developed by AMD, produced in 28nm and belong to the same microarchitecture family: Graphics Core Next (GCN). Devices based on the Fiji architecture, which include the flagship AMD Radeon R9 Fury X along with the Radeon R9 Fury and Radeon R9 Nano, are the first GPUs to feature High Bandwidth Memory (HBM) technology which is faster and more power efficient than current GDDR5 memory. However, the Rx 300-numbered GPUs in the series are based on previous generation GPUs with revised power management and therefore only feature GDDR5 memory. The Radeon 300 series cards including the R9 390X were released on June 18, 2015. The flagship device, Fury X, was released on June 24, 2015, with the dual-GPU variant, the Ra