You'll want to make sure you establish a really good baseline on the DL80 first. Need to be sure the comparison is of the various CPUs - not of the platform. The DL180 has really aggressive and power-hungry fans that can (theoretically) draw up to almost 50W each. And there are 8 of them (in four pairs that speed control together). As you already noted in the DL180 thread small changes in ambient temp can really affect fan speed, as can Bios/BMC firmware. You already saw almost 30W difference just from a bios update and a cooler evening.
Also, the 460W PSUs in the model you bought are old models and are not 80%.
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