Diagnosing a Memory Error

I'm running a Dell Precision Workstation 650 (1 yr old). It has 2GB, 266MHz,Double Data Rate SDRAM,ECC,4x512 memory. It's still covered by a service agreement; however, sometimes I like to get some expert advice before calling tech support.
      A few months ago, at boot, I would get the message "Uncorrectable memory failure ...Press F1 to continue". The Dell Diagnostics "March A Test" identified the problem in addresses 73D00000h - 73DFFFFFh as Error Code 2F00:0419, ECC Error encountered. Suspected DIMM B.
     Dell sent me 4 new DIMMs. However, I would still get the message sometimes--not all the time. I would just "Press F1 to continue..." since the machine worked fine. More recently, the machine has been freezing.
     I ran the Dell diagnostics, and got the same error code, this time for DIMM A. If I switch the first and last DIMMs, I get the same error message, identifying DIMM A as the problem. Does it seem likely that the problem really is the DIMM or something in the system board?

201410-LO-Qu-021

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