plz guys say to me ... how much can i mine UTC with 4 card R9 290 in 24 hour with new N factor ?
I believe about 320 coins +/- 20 coins @ current difficulty
That can't be the explanation, block size is 50 not 52
the 2 extra coins are the amount you had confirmed in pool balance before the 50 block got confirmed. All funds would've been sent at the same time.
It matters the method that you get your rig stable, some have gotten it at 175 Kh / card stable, I can't get mine above 162 without HW errors . At 4 cards (3 290x, 1 290), I have a total hashrate of 640 Kh/s and routinely get 25 - 26 coins every 2.5 hours or 240 coins a day from leetpools.