@fanatic26_ and @lunobird

You are both right and you are both wrong.
As I wrote above, core-bound algos scale very well across the nvidia range when it comes to hash/watt and hash/dollar. The differences are minimal.

Now if you throw EThash, CN or algos that are badly optimised into the mix of course your results will vary. These cards aren't using the same memory across the range.

You need to compare apples to apples. And then you'll basically pick your weapon of choice according to your strategy and budget.

So according to my findings, no, 1600 series Nvidia GPUs are not significantly better than everything else.