Two questions from me:

1. I watched this clip https://www.youtube.com/watch?v=Bjs6m35zLUs where the guy says your wallet name has to be 8 characters. Mine is 10... I didn't get any warning or notification when inputting it. Also this is not mentioned in readme / wiki files, so I wonder where he got it from. Now I don't want to close the miner and change as it is already mining for 4h approx. Well, if I close it will it start all over again? From round 1 that is..

2. My second question is about hashrate. I have a mix of cards on 4 machines (one being my personal PC with 2 cards only) On one rig I got 600 M/s from R9 290 with OC, on my PC - 500 M/s from 280x again with OC but then on the 3rd , which is 6 x 280x I get avg 270 M/s per card, which is almost twice lower than my personal PC. Same win (10) , same drivers (16.6) because I was foolish enough to install win 10 which forces driver updates... The rest of components are different of course. I just don't have a clue..  

Thanks in advance