Difference between supermicro X9DA and X9DR series (dual 2011)

Kilgore23

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Jun 26, 2014
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Can someone briefly explain to me the difference between X9DA and X9DR series? I'm planning to get a pair of E5-2665s and not sure which series of these motherboards to use

From what I understand the X9DA is more suited for a workstation and the X9DR is for servers? But could anyone help elaborate on why that is?