AMD gpu is not have best track record in power use

TECHNICAL SPECIFICATIONS

GPU :

Hawaii (GCN)

Process :

28 nm

Shader Units :

5632 (2 x 2816)

Texture Units :

352 (2 x 176)

ROPs :

128 (2 x 64)

Core Clock :

up to 1018 MHz

Memory Clock :

1,250 MHz GDDR5

Memory Bus :

512-bit

Memory Bandwidth :

320 GB/s

Memory Capacity :

8 GB (2 x 4 GB)

DirectX, Shader, OpenGL :

11/5.0/4.2

Max. TDP :

500 W

Aux. Power Connector(s) :

2 x 8-pin PCIe

Min. Power Supply :

50A combined current to the 8-pin PCIe power connectors