Excuse me for my inaccuracy, but increasing of parallel threads leads to increasing memory usage, so more threads, more speed.
I'm not sure of my reasoning, please correct me.
Will be better if 8 Gigs cards to use full memory with increasing of speed
That may indeed be true, two threads instead of one in parallel. But not sure that will bring much - the cores are well loaded and no long idle times in 192/7. Also I do not have a 8G AMD, so can not test ^^ Maybe you can check if its indeed better to run the miner 2x on same cards, but I doubt it will bring much more then 1-2% maybe.
Hm yes indeed, may be no more advantage for doubling of threads, however have a difference between running two different instances, or one process with double of threads in empty process cycles.
If you not see the reason for possibility to increasing memory usage, ok.
One other thing, please configure miner to do not lock the log file, because cannot be read during mining process. (with tail for example) This on Windows miner version.
S E:\lolMiner_v06_alpha3_Win64\logs> Get-Content .\2018-11-24_17-14-14.log -Wait -Tail 30
et-Content : The process cannot access the file 'E:\lolMiner_v06_alpha3_Win64\logs\2018-11-24_17-14-14.log' because it is bein
used by another process.