hey there,																																				
																																					
sorry for late answer. i was very busy those days.																																	
																																					
my rig components:																																				
																																					
Asrock h81 pro btc r2.0,  4 gb gskill ram, 6 x Sapphire RX 570 Nitro+, 2 PSU's one 1300 watt evga and an old 750 watt be quiet, 6 PCI Riser VER 007s with direct sata connection, 5 additional 120mm fans, intel celeron g1840 processor, add2psu adapter, and 3 x sata to 6 pin adapter										
																																					
how it works:																																				
																																					
i started my rig with only 1 gpu and do all win 10 pro tweaks they are offered here in 1stminingrig.com without one option to set the pci speed to GEN1. i let it stay to auto.																					
Then I want to download amd driver 17.5.1 and see on the amd site there is a new one the 17.5.2 so i think i try it with this.																										
downloaded it and extract it to C:/, but dont installed it.																																	
																																					
before i do that i go into safe mode and used ddu to deinstall all current graphics driver.																													
after that i boot normally and install the 17.5.2 driver and it worked.																															
then i shut down my rig and plug in my second card with riser in the x16 pci bus and started, but the rig dont give me a picture.																										
so i think the problem is the x16 pci bus.																																		
i shut down another one and plug the card with riser in the x1 bus and now it works.																														
shut down another one and plugged 5 graphics card with risers into the pci x1 buses. all good but they don't really appear in device manager, so for now my monitor is going black for 10 seconds and in device manager the second rx 570 card was fully installed, that procedure was doing for all cards. i think windows recognizes that all cards are the same and install it with the driver on C:/ for itself.
																																					
so all looks good but when i connected the last card with riser in the x16 pci bus the rig don't show anything on monitor.																										
																																					
so i plugged it out and start in uefi of mainboard and look around.																																
then i set the standard port pci bus for graphics card from the gpu to inside graphics. saved it plugged 6 card in x16 bus and started the rig.																								
																																					
and i look for this the rig starting, after log on in windows the procedure is windows doing for the 6th card and all 6 rx 570's were installed successfully.																							
																																					
The graphic cards are all actually running with complete standard settings, only a little setting i do is to set it to -50mv.																										
																																					
in sapphire trixx it says a power consume per card with 130 watt.																																
im actually ethereum mining and get a speed of each card with 24 MH/s stable.																														
																																					
im waiting for oc, undervolt and mod for those cards that is stable.																															
																																					
by the way all 6 graphics card are connected with both power connectors 8- and 6 pin.																													
5 of them on the 1300 watt and the last one on the 750 watt psu.																																
																																					
i hope i can help someone to solve his issue with this what i do.																																
																																					
somebody has question to me pls ask, i will help when i can.