The hp 12g sas expander card provides internal storage expansion within the hp proliant gen9 server by allowing support for more than 8 internal hard disk drives when connected to a gen9 supported smart array or smart hba controller this full height card supports 12gbs sas connectivity and features 9 internal ports with a maximum of 26 physical links the 12g sas expander card is ideal for proliant dl380 dl180 and ml350 gen9 server users who want to raid more than 8 internal hard disk drives o