# Power architecture The CPU subsystem architecture describes the organization of CPU cores and their power domains. Understanding the architecture helps you to monitor the CPU core usage and balance the power consumption and performance of the device. > > > Tab QCS6490/QCS5430 > Tab IQ-9075 > Tab IQ-8275 > Tab IQ-615 > > APSS is a set of CPUs organized into clusters. All CPU cores in a > cluster operate at a similar frequency. Each CPU core in a cluster has a > dedicated L1 and L2 cache. > > > The CPU subsystem consists of three clusters and L3 cache as follows: > > > - Qualcomm^®^ Kryo^™^ CPU Prime cluster, which has a performance CPU core > - Kryo Gold cluster, which has CPU cores with balanced power and performance > - Kryo Silver cluster, which has low power CPU cores for lightweight applications > - Common L3 cache > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > **Figure : QCS6490/QCS5430 APSS CPU subsystem architecture** > > The CPU subsystem operates on two power domains, each supplied by a dedicated switched mode power supply (SMPS) rail. > > > The following are the supported power domains: > > > > > > > > > Table : Power domains and their descriptions > > > > > > | Power domains | Description | > > | --- | --- | > > | `VDD_APC0` | Power domain for the Silver cluster CPU cores and L3 cache digital circuit | > > | `VDD_APC1` | Power domain for the Gold and Prime clusters CPU cores | > > | `Chip_MX` | Power domain for the L1, L2, and L3 cache memories | > > > > > > > > Note > > > > > > To know more about CPU core arrangement, see [QCS6490 Data Sheet](https://docs.qualcomm.com/bundle/publicresource/topics/80-23889-1/device-description.html) > > and [QCS5430 Data Sheet](https://docs.qualcomm.com/bundle/publicresource/topics/80-23889-1/device-description.html). > > The CPU subsystem consists of two clusters with a dedicated L3 cache for each cluster. > Each CPU core in a cluster has a dedicated L1 and L2 cache. All CPU > cores in a cluster operate at a similar frequency. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > **Figure : IQ-9075 APSS CPU subsystem architecture** > > The CPU subsystem operates on two power domains, each supplied by a > dedicated SMPS rail. > > > The following are the supported power domains: > > > > Table : Power domains and their descriptions > > > | Power domains | Description | > | --- | --- | > | `VDD_APC0` | Power domain for Cluster0 CPU cores and L3 cache digital circuit | > | `VDD_APC1` | Power domain for Cluster1 CPU cores and L3 cache digital circuit | > | `Chip_MX` | Power domain for the L1, L2, and L3 cache memories | > > > > To know more about CPU core arrangement, see [IQ-9075 Data > Sheet](https://docs.qualcomm.com/bundle/publicresource/topics/80-73417-1/device-description.html). > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > APSS is a set of CPUs organized into clusters. All CPU cores in a cluster operate at a similar frequency. Each CPU core in a cluster has a > > > dedicated L1 and L2 cache. > > > > > > > > > The CPU subsystem consists of three clusters and L3 cache as follows: > > > > > > - Kryo Prime cluster with performance CPU cores > > - Kryo Gold cluster, which has CPU cores with balanced power and performance > > - Kryo Silver cluster, which has low power CPU cores for lightweight applications > > - Silver cluster has a dedicated L3 cache > > - Gold and Prime clusters share a dedicated L3 cache > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > **Figure : IQ-8275 APSS CPU subsystem architecture** > > > > > > The CPU subsystem operates on two power domains, each supplied by a > > > dedicated SMPS rail. > > > > > > > > > The following are the supported power domains: > > > > > > > > > > > > Table : Power domains and their descriptions > > > > > > > > > | Power domains | Description | > > > | --- | --- | > > > | `VDD_APC0` | Power domain for the Gold and Prime cluster CPU cores and L3 cache digital circuit | > > > | `VDD_APC1` | Power domain for the Silver cluster CPU cores and L3 cache digital circuit | > > > | `Chip_MX` | Power domain for the L1, L2, and L3 cache memories | > > > > To know more about CPU core arrangement, see [IQ-8275 Data > Sheet](https://docs.qualcomm.com/bundle/publicresource/topics/80-73475-1/device-description.html). > > > > > > > APSS is a set of CPUs organized into clusters. All CPU cores in a cluster operate at a similar frequency. Each CPU core in a cluster has a > > dedicated L1 and L2 cache. > > > > The CPU subsystem consists of two clusters and L3 cache as follows: > > - Qualcomm^®^ Kryo^™^ Gold cluster, which has CPU cores with balanced power and performance > - Kryo Silver cluster, which has low power CPU cores for lightweight applications > - Common L3 cache > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > **Figure : IQ-615 APSS CPU subsystem architecture** > > > > The CPU subsystem operates on two power domains, each supplied by a > > dedicated SMPS rail. > > > > > > The following are the supported power domains: > > > > > > > > Table : Power domains and their descriptions > > > > > > | Power domains | Description | > > | --- | --- | > > | `VDD_APC0` | Power domain for the Silver cluster CPU cores and L3 cache digital circuit | > > | `VDD_APC1` | Power domain for the Gold cluster CPU cores | > > | `Chip_MX` | Power domain for the L1, L2, and L3 cache memories | > > > > To know more about CPU core arrangement, see [IQ-615 Data > Sheet](https://docs.qualcomm.com/bundle/publicresource/topics/80-73480-1/device-description.html). ## Next steps - [Power states and features](https://docs.qualcomm.com/doc/80-70022-30/topic/powerfeatures.html#powerandthermalfeatures) Last Published: Sep 25, 2025 [Previous Topic Get started with power optimization workflow](https://docs.qualcomm.com/bundle/publicresource/80-70022-30/topics/get-started.md) [Next Topic Power states and features](https://docs.qualcomm.com/bundle/publicresource/80-70022-30/topics/powerfeatures.md)