gpu-z only shows draw from pcie, which I think for newer cards is mostly memory related
Even so, If I'm getting 35 sols drawing 40w and someone else is getting 50 sols drawing 100w how can that be irrelevant?
You do the math
PS: I pay for my electric bill!
It's not completely irrelevant. But you absolutely CANNOT accurately use GPUz power draw to compare different cards because they all have different power characteristics. It's only good for doing apples to apples comparisons.
For example, mining Ethereum, I have RX480s that say 70~75w in GPUz but this relates to more like 120w from the wall. So a 50w difference.
But my 290x, say around 130w in GPUz, but 200w from the wall, that's a 70w difference.
Basically, you have almost no way of telling actual power draw from the wall with GPUz, it's just a guessing game. And power draw from the wall is what actually counts.
And why do you need 2 x 850w PSU to power 6 x RX480? Even mining Ethereum at 180mh/s my 6 x RX480 only pull 810w, from the wall. You certainly don't need it for ZCash, I'm not even pulling 600w from the wall.
Really 600w for 6 480s, thats crazy.....Would 470s be slightly lower?
if somebody can share another claymore link i'll be glad 
