In Ubuntu if run all the video cards in the same window, the performance drops very much. And the more cards, the lower the productivity of each.

GOT MY ACCOUNT SORTED THANKS TO THE BETTER BUSINESS BUREAU (BBB)

After 4 months of frustration and stress, tried everything no success to get my account enabled.  Someone mentioned the BBB https://www.bbb.org/en/us, were taking complaints and they would contact Bittrex. I went online and filled in the form, explained my situation, the BBB replied within few hours and they sent the complaint to Bittrex and within 48 hours, had my account enabled after 4 long months!!!. BBB sent me an email to see if my complaint was resolved satisfactorily. Thank you, Better Business Bureau for your help!! They already had over 100 complaints regarding Bittrex, 99% have been sorted. Try it out.