It’s otherwise known as a p520
They can run AIX, iSeries, Linux, and Virtual IO servers (very useful for allowing an iSeries partition to boot and use normal 512b disks also meaning no IOPS for allowing boot devices)
The base unit can always run an iSeries partition as I know but the key is it’s limited to a low number of CPW even on the even 1 core limit without any license added.