All Products
Search

This Product

    Elastic Compute Service:CPU options of compute-optimized instance types

    Document Center

    Elastic Compute Service:CPU options of compute-optimized instance types

    Last Updated:Jun 23, 2025

    You can specify CPU options for specific Elastic Compute Service (ECS) 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 based on your application performance requirements. This approach helps you improve performance and control costs. This topic lists the values related to the number of physical CPU cores and the number of threads per core for each instance type in compute-optimized instance families. You can use these values when specifying CPU options.

    c9i 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.c9i.large

    2

    1

    2

    1 and 2

    ecs.c9i.xlarge

    4

    2

    2

    1 and 2

    ecs.c9i.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c9i.3xlarge

    12

    2, 4, and 6

    2

    1 and 2

    ecs.c9i.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c9i.6xlarge

    24

    2, 4, 6, 8, 10, and 12

    2

    1 and 2

    ecs.c9i.8xlarge

    32

    2, 4, 6, 8, 10, 12, 14, and 16

    2

    1 and 2

    ecs.c9i.12xlarge

    48

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, and 24

    2

    1 and 2

    ecs.c9i.16xlarge

    64

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32

    2

    1 and 2

    ecs.c9i.24xlarge

    96

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, and 48

    2

    1 and 2

    ecs.c9i.32xlarge

    128

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, and 64

    2

    1 and 2

    ecs.c9i.48xlarge

    192

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, and 96

    2

    1 and 2

    c8a 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.c8a.large

    2

    1

    2

    1 and 2

    ecs.c8a.xlarge

    4

    2

    2

    1 and 2

    ecs.c8a.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c8a.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c8a.8xlarge

    32

    2, 4, 6, 8, 10, 12, 14, and 16

    2

    1 and 2

    ecs.c8a.12xlarge

    48

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, and 24

    2

    1 and 2

    ecs.c8a.16xlarge

    64

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32

    2

    1 and 2

    ecs.c8a.24xlarge

    96

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, and 48

    2

    1 and 2

    ecs.c8a.32xlarge

    128

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, and 64

    2

    1 and 2

    ecs.c8a.48xlarge

    192

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, and 96

    2

    1 and 2

    c8ae 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.c8ae.large

    2

    1

    2

    1 and 2

    ecs.c8ae.xlarge

    4

    2

    2

    1 and 2

    ecs.c8ae.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c8ae.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c8ae.8xlarge

    32

    2, 4, 6, 8, 10, 12, 14, and 16

    2

    1 and 2

    ecs.c8ae.16xlarge

    64

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32

    2

    1 and 2

    ecs.c8ae.32xlarge

    128

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, and 64

    2

    1 and 2

    c8i 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.c8i.large

    2

    1

    2

    1 and 2

    ecs.c8i.xlarge

    4

    2

    2

    1, 2

    ecs.c8i.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c8i.3xlarge

    12

    2, 4, and 6

    2

    1 and 2

    ecs.c8i.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c8i.6xlarge

    24

    2, 4, 6, 8, 10, and 12

    2

    1, 2

    ecs.c8i.8xlarge

    32

    2, 4, 6, 8, 10, 12, 14, and 16

    2

    1 and 2

    ecs.c8i.12xlarge

    48

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, and 24

    2

    1, 2

    ecs.c8i.16xlarge

    64

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32

    2

    1 and 2

    ecs.c8i.24xlarge

    96

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, and 48

    2

    1 and 2

    ecs.c8i.48xlarge

    192

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, and 64

    2

    1 and 2

    c7a 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.c7a.large

    2

    1

    2

    1 and 2

    ecs.c7a.xlarge

    4

    2

    2

    1 and 2

    ecs.c7a.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c7a.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c7a.8xlarge

    32

    2, 4, 6, 8, 10, 12, 14, and 16

    2

    1 and 2

    ecs.c7a.16xlarge

    64

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32

    2

    1 and 2

    ecs.c7a.32xlarge

    128

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, and 64

    2

    1 and 2

    c7 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.c7.large

    2

    1

    2

    1 and 2

    ecs.c7.xlarge

    4

    2

    2

    1 and 2

    ecs.c7.2xlarge

    8

    2, 4

    2

    1, 2

    ecs.c7.3xlarge

    12

    2, 4, and 6

    2

    1 and 2

    ecs.c7.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c7.6xlarge

    24

    2, 4, 6, 8, 10, and 12

    2

    1 and 2

    ecs.c7.8xlarge

    32

    2, 4, 6, 8, 10, 12, 14, and 16

    2

    1 and 2

    ecs.c7.16xlarge

    64

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32

    2

    1 and 2

    ecs.c7.32xlarge

    128

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, and 64

    2

    1 and 2

    c6a 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.c6a.large

    2

    1

    2

    1 and 2

    ecs.c6a.xlarge

    4

    2

    2

    1, 2

    ecs.c6a.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c6a.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c6a.8xlarge

    32

    2, 4, 6, 8, 10, 12, 14, and 16

    2

    1, 2

    ecs.c6a.16xlarge

    64

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32

    2

    1 and 2

    ecs.c6a.32xlarge

    128

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, and 64

    2

    1 and 2

    c6 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.c6.large

    2

    1

    2

    1 and 2

    ecs.c6.xlarge

    4

    2

    2

    1 and 2

    ecs.c6.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c6.3xlarge

    12

    2, 4, and 6

    2

    1 and 2

    ecs.c6.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c6.6xlarge

    24

    2, 4, 6, 8, 10, and 12

    2

    1 and 2

    ecs.c6.8xlarge

    32

    2, 4, 6, 8, 10, 12, 14, and 16

    2

    1, 2

    ecs.c6.13xlarge

    52

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, and 26

    2

    1 and 2

    ecs.c6.26xlarge

    104

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, and 52

    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 Specify CPU options.