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Overview
Radeon R9 390X is a High-End Graphics Card based on the First Revision of the Graphics Core Next (GCN) Architecture.

Architecture
The GCN 1.1 revision of the Graphics Core Next Architecture adds new important technologies and is largely oriented for energy efficiency. New technologies such as PowerTune and TrueAudio are the biggest additions as well as DirectX 11.2 support.

GPU
It equips a GPU Codenamed Grenada XT which has 44 Compute Units activated and thus offers 2816 Shader Processing Units, 176 TMUs and 64 ROPs. The Central Unit is clocked at 1050MHz.

Memory
The GPU accesses a 8GB frame buffer of fast GDDR5, through a 512-bit memory interface. The size of the frame buffer is exaggerated and in no way benefits the GPU. The Memory Clock Operates at 1500MHz.

Power Consumption
With a rated board TDP of 290W, it requires at least a 750W PSU with one available 6-pin and one available 8-pin connectors.

Performance
Radeon R9 390X competes with GeForce GTX 980 and is essentially a Higher Clocked Radeon R9 290X with the addition of twice as much video memory (8GB against 4GB).
Its Performance lies somewhere between GeForce GTX 970 and GeForce GTX 980, as does its price.
However, the lack of DirectX 12.1 Support paired with the enormous Power Consumption (almost twice as much as GeForce GTX 980) and the Gimmicked 8GB Frame Buffer, makes it an extremely uncompetitive product.
Still, Radeon R9 390X 8GB is around $120 cheaper than GeForce GTX 980 and performs reasonably better at 4K, though it is still best suited for 2560x1600.

System Suggestions
Radeon R9 390X is best suited for resolutions up to and including 2560x1600. We recommend a Very Strong Processor and 8GB of RAM for Optimal Performance.