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GPUPerfAPI is AMD's library for accessing GPU performance counters on ATI Radeon graphics cards. It is used by GPU PerfStudio 2 and the AMD APP Profiler and is now available to third party developers who wish to incorporate it within their own applications. GPUPerfAPI supports DirectX10, DirectX11, OpenGL, and OpenCL applications.Release NotesVersion 2.8 (4/22/11) DirectX 10: Fixed GPUTime support on AMD Radeon HD 2000 and 3000 Series hardware. DirectX 11: Fixed counter accessibility on AMD Radeon HD 2000 and 3000 Series hardware.