How much 280x earns btc per day mining sync at the moment? Is there a calculator somewhere?
should be around 100k satoshi, abysmally low
From multipool you can get Syncs ~225k sathoshi day rate with your 280x.
Multipool current rate is around 0.003-0.0035 BTC/MH/day.
X11 multipoolmining coming available hopefully later today.