Hello Paolo   No, the only supported internal RAID controller is the SAS 5/iR. The SAS 5/iR does not have cache. The PERC 5/i is not supported on the 860. The only supported controllers that contain cache are external controllers like the PERC 5/e. You might be able to get a PERC 5/i to work in the server, but we have not validated it for the 860. There are not multiple versions of the PERC 5/i that were released, so I'm fairly confident that most or all of the part numbers you found will work. Whenever we change anything about a part we will give it a new part number. For instance, if we decide to start using a different anti-static bag to ship the PERC 5/i in then we would give it a new part number. You can review validated controllers here. The 860 is listed under the legacy tab: [URL] Thanks
 I would like to add RAID 1 functionality to a PowerEdge 860 server we have in the office.  I have been unable to determine what is the Dell part number for the RAID Controller for this server.   Is there a Dell RAID controller with BBU Cache memory that can support the PE860?   Would the PERC 5/i raid controller work?  If so which Dell model number is compatible.  As the PE860 has long since been retired there is nothing from Dell's website.  Looking on the web I have found no less than 6 different Dell part numbers for a PERC 5/i controller.   Thanks in advance if anyone can be of assistance.   -Paolo 
PowerEdge 860 - PERC RAID Controller Compatibility