It is difficult to really give you a good combination as it all depends on your requirements and the use of the server system. On this link you will find more information about this particular server board where you can check for compatibilities as well.
You can also use the server configurator tool: http://serverconfigurator.intel.com/default.aspx
My advice will be if you are going to put up a system and this processor, make sure you get all the components properly and use compatible components that are found on the tested hardware list available from the link above. As long as you use tested hardware, the system will be more stable and if there is any issue it is easier to troubleshoot.
Hope will be helpful to you.