i have same problem
i think i updating tomorrow to windows 10
i think windows 7 have problem more 5 graphik cards
5 cards running
6 cards 2 cards going to error 43
i try all with 6gpu mod
pixel patcher etc
nothing run
i dont know whats going wih this
I don't know about your error cause, but in order to build a mining machine in Windows. You should use Windows 10 instead of Windows 7, Windows 10 will make your GPU better hashrate campared to Windows 7.