Available Shapes
Micro instances (AMD processor): All tenancies get up to two Always Free VM instances using the VM.Standard.E2.1.Micro shape, which has an AMD processor.
Ampere A1 Compute instances (Arm processor): All tenancies get the first 3,000 OCPU hours and 18,000 GB hours per month for free for VM instances using the VM.Standard.A1.Flex shape, which has an Arm processor. For Always Free tenancies, this is equivalent to 4 OCPUs and 24 GB of memory.
In regions with multiple availability domains:
You can create Ampere A1 Compute instances in any availability domain.
Instances using the VM.Standard.E2.1.Micro shape can only be created in one availability domain.
Number of Compute Instances Available to Your Account
Depending on the size of the boot volume and the number of OCPUs that you allocate to each Ampere A1 Compute instance, you can create up to four compute instances. The minimum boot volume size for each instance is 47 GB, regardless of shape. Your account comes with 200 GB of Always Free block volume storage which you use to create the boot volumes for your compute instances.
For example, using the default boot volume size of 47 GB, you could provision two instances using the VM.Standard.E2.1.Micro shape, and two Ampere A1 Compute instances that each have 2 OCPUs. Or, you could provision four Ampere A1 Compute instances with 1 OCPU each, and zero instances using the VM.Standard.E2.1.Micro shape. Many combinations are possible, depending on how you allocate your block storage and Ampere A1 Compute OCPUs. See Details of the Always Free compute instances for more information on allocating OCPU and memory resources when creating Ampere A1 Compute instances.