I see on the custom build page that you can build it with the X3230 Xeon Quad-Core processor. Will the Poweredge support the X3370 Quad-Core processor? Will it support any LGA775 type or what are the factors that dictate what processors you can run?
other factor, mainly the chipset used and what Dell decided to not allow.
Find out what chipset is in the server - look it up on www.intel.com and it will tell you compatible CPU's, however even with that there is no garuntee.