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.
http://organofcorti.blogspot.com/2012/10/71-variable-pool-difficulty.htmlThe number of shares submitted by a miner with a contant hashrate follows a Poisson distribution. The standard deviation - a measure of how much a variable varies - increases only as the square root of the average number of shares per time period. Thus the more shares submitted in a given time period the lower the variability in shares submitted for that time period. So the lower the difficulty, the lower the variance, and the longer the time period over which the number of shares is assessed, the lower the variance.
Check your
U value (submitted shares/minute). At that hashrate, I'd expect you to be around 1-2 shares/min, which consulting the table above yields an hourly ~18% variance (~3.6% daily).