Originally posted by: ther00kie16
Well, if yours is on 24/7, then the 4850e seems like the best bet since 24/7 for 1yr at 12w difference is about 100kwh, which will be almost $20 depending on your energy costs.
One thing I will mention as a Brisbane owner (4000+) is that they don't require stock voltage so you can lower the power draw by lowering the voltage. Mine works on 1V (stock is 1.25V) at stock speed. So according to this power calculator
link it only draws 42w at load.
However, the 4850e can probably be undervolted too, though it would take some googling to figure out to what extent.