I changed the main system to the latest i7-7700k. With 16gb ddr4 at 2133, and the same GTX1070. I also tried 2 cards:

2 cards slow down your XP11 system! I did a check. A new i7700k system, with a 1070 on 3 screens gives 30+ frames. Same system, now added a 1050ti to power 1 screen, and then 1070 for the remaining 2: 25-30 frames. Just to let you guys know! No benifit!