People fail to grasp that a thing drawing power at idle is the memory, which doesn't have a useful idle state. It must be refreshed constantly. 16GB is pretty reasonable. 8GB would be more efficient if you can get away with it. If you lard up a workstation with tons of RAM you don't need, you pay for it on your power bill.
Had almost the same setup and saw about 32W idle on mine.
T110 II with Xeon E3 1220, 4 Gb RAM ECC, 1x 128 GB SATA SSD + 1x 6 To HDD IronWolf on a PERC H200 PCIe card.
With a WD 10 GB external HDD, the UPS gives me a 50W load.