A question like that,Why buying card who cost 1000$ and make 25-30MH on ETH while you can take these amd 290 for 200 buck and same/better perf
Maybe im not aware and there's special miner for nvidia. But buying nvidia card isn't really profitable,specially if you have farm!
Even at 25-30 MH, the GPU is profitable.
The question is : Is ETHminer is optimized for Pascal technology yet? No. At the moment, every miners are limited to Maxwell technology.

What kind of improvement could be met with Pascal Implementation? I don't know.
The other way to see it is that NVIDIA GPU is more profitable on 90% of the algos. According to some members who own some 1080, these are more profitable on some other algos. Someone talk about a 96 days ROI on one of them.
Now, this was not MINEUM choice to get 1080 since it has been voted by the shareholders.

What's the ICO price per coin of MNM?
Also, any new nodes? Can't get my wallet to sync
3002 satos (ICO Price)
Can you give us more information about your wallet (OS X, Windows, Linux and which wallet do you have)?