GCN 3.0 is most notably associated with Fiji, the die behind the Radeon R9 Fury and Fury X, which introduced High Bandwidth Memory (HBM) to a consumer GPU for the first time in 2015. Fiji was manufactured on 28nm and connected to 4 GB of HBM1 via a silicon interposer at 512 GB/s of memory bandwidth — far ahead of GDDR5 configurations of the era. The generation also encompasses Tonga and Antigua (R9 380/380X), though the HBM integration was the defining feature.
First consumer GPU with HBM (High Bandwidth Memory): Fiji pairs four HBM1 stacks on a silicon interposer for 512 GB/s bandwidth at 4 GB capacity.
Compact die footprint: the small Fiji die + HBM package enabled the Radeon R9 Nano, a full-performance GPU in a Mini-ITX form factor.
DirectX 12 feature level 12_0 and Vulkan 1.0 compliance.
Liquid cooling on the Fury X reference design — AMD's first all-in-one liquid-cooled reference GPU.
GCN 3.0's Fiji demonstrated HBM's viability for consumer discrete GPUs over a year before NVIDIA's HBM2 adoption in Pascal. The silicon interposer approach was a significant packaging engineering milestone for AMD and established the groundwork for future HBM designs in the Vega generation. The Fury X remains collectible as the first HBM consumer GPU.