I took borrowed this from a 24 page Micron document on Micron DDR3 Power Consumption. At no point did I see any discussion about memory capacity, but I also did not read everything. The link to the PDF is below if you want to read it.
Near same - if figuring wattage - I just throw out 4W per stick as things will vary based on electrical draw (typical DDR3 may be 1.25, 1.35, 1.5, 1.6 or 1.65 volts)
I took borrowed this from a 24 page Micron document on Micron DDR3 Power Consumption. At no point did I see any discussion about memory capacity, but I also did not read everything. The link to the PDF is below if you want to read it.