Hi, if there is a Mezz installed propably the LSI 2008 Mezz. You cannot use the ICH10. It has an other internal cabling.  With this config, you can run individual nodes.  Please be aware, the systems the vendor offers are out of service @ Dell or be a broker system from Dell Datacenter Solution that runs for a long time. So please check the servicetag with your local support first, before you buy the system. 
I read the information that you had with a previous customer regarding the C6100 and found it very useful.  I was wondering if you could answer more questions for me. I am considering buying one of these.  My purpose is going to be different then what is intended for.  i would like to build 4 seperate systems in one box.  Is that possible? I read that in order to install the Operating systems, that the onboard intel ICH10 would not work. In order to do so, I need to get the raid card to divide them up. My next question is, How many RAID Mezzanine Cards can I put in the Dell C6100?  I read, don't remember where, that the c6100 houses only 2 RAID Mezzanine Cards?  Is that true? Thanks in advance
Dell C6100 Question