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Here is the official info on tested memory for your board: http://www.intel.com/support/motherboards/desktop/d850mv/sb/cs-009912.htm
The test lab results are here: http://www.cmtlabs.com/mbCertPartSearchResults.asp?sManuf=Intel&bNav=True&sMN=D850MD%2FD850MV&oSubmit=Search
(all the modules are now EOL). The internal tested memory results are here: http://www.intel.com/support/motherboards/desktop/d850mv/sb/CS-009913.htm
I don't think we test the Dell upgrade memory in our motherboards. You can look at the list of tested memory and maybe get a good idea about the Dell memory.