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I see that you are looking for information on Xeon boards’ comparability to use dual processor; usually, that comparability is reviewed with the manufacturer of the board, could you provide us the motherboard information?
Hello Leonardo C.
My server is Cisco UCS C220 M3 Rack Server, support 2 E5 26xx v1 or v2 cpus. and the cpu support list only show the E5 26xx series without E5 46xx series. Usually the sever that has two cpus will not list the E5 4xxx (xeon MP).
Here's the information of my sever. Cisco UCS C220 M3 Rack Server Data Sheet - Cisco
Thank you !