# HSM types in AWS CloudHSM
<a name="hsm-types"></a>

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:


| Differentiating feature | hsm1.medium | hsm2m.medium | 
| --- | --- | --- | 
| **Cluster mode compatibility** |  Available for clusters in FIPS mode.  |  Available for clusters in FIPS or non-FIPS mode.  | 
| **Network type compatibility** |  Not available  |  Available for clusters in FIPS or non-FIPS mode.  | 
| **Backup compatibility** |  Can be used to backup and restore to **hsm1.medium** and **hsm2m.medium** clusters in FIPS mode.  |  Can only be used to backup and restore **hsm2m.medium** clusters.  | 
| **Key capacity** |  3,300 per cluster.  |  16,666 total keys, with asymmetric keys having a maximum of 3,333 per cluster.  | 
| **[Client SDKs](use-hsm.md)** |  Supports all Client SDKs.  |  Supports all Client SDKs.  | 
| **[Client SDK versions](client-history.md)** |  Compatible with SDK version 3.1.0 and later.  |  Compatible with Client SDK version 5.9.0 and later.  | 
| **Region availability ** |  CloudHSM no longer supports creating new clusters in any AWS Region. For more information, see [Deprecation notifications](compliance-dep-notif.md#hsm-dep-1) for details.  | Available in AWS Regions that [CloudHSM is available.](https://docs.aws.amazon.com/general/latest/gr/cloudhsm.html) | 
| **Performance** | To see the performance of each HSM type, refer to [AWS CloudHSM performance information](performance.md). | 
| **Certification** |  FIPS 140-2, PCI DSS, PCI PIN, SOC2, and PCI-3DS compliant.  |  FIPS 140-3, PCI DSS, PCI PIN, SOC2 and PCI-3DS compliant.  |