The R9 280X is powered by the same GPU as the Radeon HD 7970.
Tahiti has 2048 shaders, 128 TMUs, and 32 ROPs and is based on the GCN architecture.
The R9 280X is somewhat faster than the HD 7970, with a core speed of 1050 MHz (max. Boost) and a memory clock of 1500 MHz
Although the 280X supports DirectX 12 (FL 11_1), it lacks True audio.
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