Today we are pleased to announce two new Virtual Machine (VM) sizes, E64i_v3 and E64is_v3, which are isolated to hardware and dedicated to a single customer. These VMs are best suited for workloads that require a high degree of isolation from other customers for compliance and regulatory requirements. You can also choose to further subdivide the resources by using Azure support for nested VMs.
The E64i_v3 and E64is_v3 will have the exact same performance and pricing structure as their cousins E64_v3 and E64s_v3. These size additions will be available in each of the regions where E64_v3 and E64s_v3 are available today. The small letter ‘i’ in the VM name denotes that they are isolated sizes.
Read about it in the Azure blog.