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On Intel GPUs GPU-Z measures GPU utilization via Direct3D calls.  Such Direct3D calls are not used by AIDA64 simply because they aren't fully reliable.  Limitation #1: they only measure Direct3D load, and not the actual GPU load.  Hence, if you start a computing task (via OpenCL), the Direct3D "GPU utilization" value will not show the actual GPU utilization, but a much lower value.  Limitation #2: those Direct3D calls only works properly on single-GPU systems, due to the fact that Direct3D doesn't properly support multiple GPU devices.





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