Yes, The PERC H800 controller is compatible with the PE R710. If you have an open slot in the server you can add the H800 and then connect the MD1200 to that controller. You would be able to manage both from inside the Open Manage Server Administrator. I would advise to ensure that OMSA is up to date to the latest version .
Hi, I have a PE2950 with windows 2008r2 with a PERC6/e controller with two external ports.  One of the ports is attached to a MD1000 disk array.  I need more storage and I'm looking at getting an MD1200.  Can I attach the other external port on the PERC6e to a MD1200 Disk Array?  Suggestions? Thanks! -sul. 
Can MD1000 and MD1200 live together nicely on a PERC6e?