Great question! It really depends on the workload. We already support NVMe instances as small as 4 GB RAM / 2 vCPUs. For HA setups, you could go with one standby (with configurable synchronous replication) or two standbys (cross-AZ, with quorum-based replication). So yes, there is some additional cost from a hardware perspective due to the standbys, but depending on the workload, NVMe performance could offset those costs. On top of this, there’s a separate topic around the reliability/availability promises of separating storage and compute for an OLTP Postgres database.