I was able to find the information being referenced. With the hardware you have, you'll be limited to the 5500 series. Based on the information available on Intel's website, it does not appear that you will be able to use a hexacore processor.    Here's the relevant page on Intel's site:    [URL]   I sorted based on core count, but didn't see an option in the series.
Is there a way to tell which revision my Dell R410 mother board is, preferably without iDRAC or OMSA (I have neither). I have a service tag number.   Also, is there any clarifying documentation on which CPUs are available with which revisions? The documentation says that all r410s support 5600s, but it then goes on to only cite 5500 CPUs.   I am trying to get a hexacore with HT for my r410, but I am not sure if it is compatible or not. 
Dell R410 revision?