None left I think.
Just difficulty from added hash power.
That's what I thought too. Anyone else heard the same or something different?
Spike will happen only if eth suddenly doubles or triples its price overnight, plus people are very careful about adding more gpu's cause mining could die anytime.
Well to serve your case, last time i checked, difficulty was 1.5, now is 1.85, which means 20% in few days.