Just to update this thread. The R720XD can be fitted at the factory by Dell with an LSI SAS 9207-8i PCIe Just ask your sales rep :)
Looking at this page : [URL] It says that the R720XD supports internal 6GB SAS HBA controller, however this doesn't appear on the build pages of the website, and our account team doesn't seem to know of it. We are being offered H310 PERC and H710 PERC - neither of which are suitable.  We need drives passed through to the O/S - no raid, no jbod, no raid 0 on 1 drive - we want the raw drives. The H310 can do this, but it's documented as being broken: [URL] and the perc support matrix has removed it as a feature.  I have found documentation on LSI's website stating that the LSI SAS 9207-8i PCIe card is supported in the R720xd: [URL] I also found this: [URL] which seems to be Dell documentation on how to install the controller.  We'd really like this controller, or another suitable HBA controller for 24 drives to be in the server when it arrives from the factory. Can anyone shed any light ?
R720XD internal HBA controller