What it is
Private Cloud Business Edition is also a disaggregated hyperconverged infrastructure: storage, servers and network grow independently while management stays as simple as HCI. It is driven from the HPE GreenLake cloud platform and from vSphere vCenter.
Compute is a ProLiant of your choice; storage is an HPE Alletra MP B10000, all-flash over NVMe, built for continuous availability and sub-millisecond latency.
How it differs from dHCI
Technically the two are close. The difference is the storage, the scale, and above all the operating model: PCBE is built to be run from the GreenLake portal, consumption billing included.
What to watch
Anyone choosing between dHCI and PCBE rarely decides it on the datasheets. The question is whether the platform should be operated out of a cloud portal, and who in your own building still needs which rights afterwards.