These are implemented by emulation on some TeraScale (microarchitecture) GPUs. OpenGL 4.x compliance requires supporting FP64 shaders.A GPU implementing TeraScale (microarchitecture) version " Northern Islands (VLIW4)" is found on APUs whose GPUs are branded with the Radeon HD 7000 series.A GPU implementing TeraScale (microarchitecture) version " Evergreen (VLIW5)" is found on Radeon HD 7670 and below branded discrete GPUs.A GPU implementing Graphics Core Next is found on the Radeon HD 7730 and above branded discrete GPUs.Graphics Core Next was introduced with the Radeon HD 7000 Series. 5.2 Free and open-source graphics device driver "Radeon".5.1 AMD's proprietary graphics device driver "Catalyst".
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