Hello. The Intel Xeon E5507 SLBKC Quad-Core 2.27GHz is not a supported processor on the R710 server. When using more than 1 Processor, the processors have to match in every specification. See below the supported processors on this server. Consider purchasing another L5506 processor instead. [IMAGE] 
While trying to study for Server + cert I picked up a PowerEdge R710 with a L5506 installed.  While half asleep from reading all the tech manuals I could locate about RAM configuration I ordered ram and another processor the E5507 (thought I was ordering the same processor that was installed but messed up and ordered E5507 not the L5506).  Was tired trying to let all the rules regarding memory slots to use and was used to just caring about socket type being this is the first time I am going to touch a multi processor main board.   Is it possible to have both installed on the R710 board or will they not play well with each other?  It seemed they would not based on information from another forum and something from the CPU upgrade site.   Any help is greatly appreciated I don't mind even following a link and doing the research myself just need some guidance.  This community seems great and am happy to join. Thanks, dmfh
Can I have L5506 Xeon Processor, 2.13GHz 4M Cache and Intel Xeon E5507 SLBKC 
Quad-Core 2.27GHz on same board