# HSM types in AWS CloudHSM
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AWS CloudHSM also offers two hardware security module (HSM) types: *hsm1.medium* and *hsm2m.medium*. Review the details on this page before deciding which HSM type is right for your needs. 

In addition to cluster modes, AWS CloudHSM offers two HSM types: *hsm1.medium* and *hsm2m.medium*. Each HSM type uses different hardware, and each cluster can only contain one type of HSM. The following table lists the major differences between the two:

[See the AWS documentation website for more details](http://docs.aws.amazon.com/cloudhsm/latest/userguide/hsm-types.html)