I have an Asrock z87 Extreme 9/ac. I can get 4 cards running properly without risers.
I f I use any number of risers, powered or not -- Windows 7 will either not boot all the way to desktop, or it will boot but one or more of the cards will have a code 43 error.
I've ordered new riser cables, just to see if the one I bought were crap...but can anyone think of something that can help make this setup work with cables?
note:when I say it "won't boot", I think it actually is booting -- but I can't see video. I suspect this because on the next reboot I'll get the "windows did not load properly" message.
Some motherboard are not compatible with riser, especially the new model.