Could somebody explain me the reason for bouncing of hash rate from 1.5MH/s to 2MH/s, the diff is +-500kH/s from time to time. Is this because of the pool problems, or am I pushing the cards too much? Have three MSI 280x cards, running C:1050 M:1500 and thread concurrency:14336...it's really annoying to see that the cards aren't doing its max profit.