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    Elastic Compute Service:CPU options of instance types with high clock speeds

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    Elastic Compute Service:CPU options of instance types with high clock speeds

    Last Updated:Jun 17, 2025

    When you call the RunInstances operation to create ECS instances, you can specify CPU options for specific instance types. The CPU options of an ECS instance include the number of physical CPU cores and the number of threads per core. You can adjust the number of vCPUs allocated to an ECS instance by changing the number of physical CPU cores and the number of threads per core of the ECS instance based on your application performance requirements. This approach helps you achieve better performance and control costs. This topic lists the values for physical CPU cores and threads per core for each instance type in instance families with high clock speeds. You can use these values when specifying CPU options.

    hfg8i instance types

    Instance type

    Default number of vCPUs

    Valid values for the number of physical CPU cores

    Default number of threads per core

    Valid values for the number of threads per core

    ecs.hfg8i.large

    2

    1

    2

    1 and 2

    ecs.hfg8i.xlarge

    4

    2

    2

    1 and 2

    ecs.hfg8i.2xlarge

    8

    4

    2

    1 and 2

    ecs.hfg8i.3xlarge

    12

    6

    2

    1 and 2

    ecs.hfg8i.4xlarge

    16

    8

    2

    1 and 2

    ecs.hfg8i.6xlarge

    24

    12

    2

    1 and 2

    ecs.hfg8i.8xlarge

    32

    16

    2

    1 and 2

    ecs.hfg8i.16xlarge

    64

    32

    2

    1 and 2

    ecs.hfg8i.32xlarge

    128

    64

    2

    1 and 2

    hfc8i instance types

    Instance type

    Default number of vCPUs

    Valid values for the number of physical CPU cores

    Default number of threads per core

    Valid values for the number of threads per core

    ecs.hfc8i.large

    2

    1

    2

    1 and 2

    ecs.hfc8i.xlarge

    4

    2

    2

    1 and 2

    ecs.hfc8i.2xlarge

    8

    4

    2

    1 and 2

    ecs.hfc8i.3xlarge

    12

    6

    2

    1 and 2

    ecs.hfc8i.4xlarge

    16

    8

    2

    1 and 2

    ecs.hfc8i.6xlarge

    24

    12

    2

    1 and 2

    ecs.hfc8i.8xlarge

    32

    16

    2

    1 and 2

    ecs.hfc8i.16xlarge

    64

    32

    2

    1 and 2

    ecs.hfc8i.32xlarge

    128

    64

    2

    1 and 2

    hfr8i instance types

    Instance type

    Default number of vCPUs

    Valid values for the number of physical CPU cores

    Default number of threads per core

    Valid values for the number of threads per core

    ecs.hfr8i.large

    2

    1

    2

    1 and 2

    ecs.hfr8i.xlarge

    4

    2

    2

    1 and 2

    ecs.hfr8i.2xlarge

    8

    4

    2

    1 and 2

    ecs.hfr8i.3xlarge

    12

    6

    2

    1 and 2

    ecs.hfr8i.4xlarge

    16

    8

    2

    1 and 2

    ecs.hfr8i.6xlarge

    24

    12

    2

    1 and 2

    ecs.hfr8i.8xlarge

    32

    16

    2

    1 and 2

    ecs.hfr8i.16xlarge

    64

    32

    2

    1 and 2

    ecs.hfr8i.32xlarge

    128

    64

    2

    1 and 2

    References

    • After you obtain the valid values for the number of physical CPU cores and the number of threads per core for an instance type, you can change the CPU options of the instance type based on your business requirements. For more information, see Specify CPU options.

    • Hyper-threading (HT) enables two threads to concurrently run on a single physical CPU core as vCPUs. To create an ECS instance that uses only physical CPU cores, disable HT for the instance. For more information, see Number of threads per core.