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# Azure compute unit (ACU)
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The concept of the Azure Compute Unit (ACU) provides a way of comparing compute (CPU) performance across Azure SKUs. This will help you easily identify which SKU is most likely to satisfy your performance needs. ACU is currently standardized on a Small (Standard_A1) VM being 100 and all other SKUs then represent approximately how much faster that SKU can run a standard benchmark.
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The concept of the Azure Compute Unit (ACU) provides a way of comparing compute (CPU) performance across Azure SKUs. This will help you easily identify which SKU is most likely to satisfy your performance needs. ACU is currently standardized on a Small (Standard_A1) VM being 100 and all other SKUs then represent approximately how much faster that SKU can run a standard benchmark
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*ACUs use Intel® Turbo technology to increase CPU frequency and provide a performance increase. The amount of the performance increase can vary based on the VM size, workload, and other workloads running on the same host.
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**ACUs use AMD® Boost technology to increase CPU frequency and provide a performance increase. The amount of the performance increase can vary based on the VM size, workload, and other workloads running on the same host.
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***Hyper-threaded and capable of running nested virtualization
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> [!IMPORTANT]
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> The ACU is only a guideline. The results for your workload may vary.
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*ACUs use Intel® Turbo technology to increase CPU frequency and provide a performance increase. The amount of the performance increase can vary based on the VM size, workload, and other workloads running on the same host.
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**ACUs use AMD® Boost technology to increase CPU frequency and provide a performance increase. The amount of the performance increase can vary based on the VM size, workload, and other workloads running on the same host.
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***Hyper-threaded and capable of running nested virtualization
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Here are links to more information about the different sizes:
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