HPE 12G SAS Expander Card The HPE 12G SAS Expander Card provides internal storage expansion within the HPE ProLiant Gen9 and Gen10 Server by allowing support for up to 28 drives when connected to a Gen10 or Gen9 supported Smart Array or Smart HBA controller. This full height card supports 12Gb/s SAS connectivity and is ideal for users who want to add additional internal storage to maximize their storage capacity.