Ubuntu 16.04, G3900, 4GB
I can start only 5 threads. System has freeze when I start 6th thread. With 7 threads I can't tested. Optiminer work correctly on this system. Now start 4 GPU with lolMiner-MNX and 3 with optiminer

Windows 10 + 1xGTX1050 work more then 2 days (crash after 30 min of post  )

Windows 10, AMD Athlon II 3xGTX1070
1xGTX1070
http://i12.pixs.ru/storage/8/2/9/1x10701min_5566932_29390829.png

3xGTX1070 (on start)
http://i12.pixs.ru/storage/8/4/6/3x107030se_8406699_29390846.png

3xGTX1070
http://i12.pixs.ru/storage/8/5/4/3x10702min_9948240_29390854.png