Quote from: Heatspeed on January 14, 2017, 04:25:16 PM

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I have 2 Rx480 and 1 Rx470

Working perfect with one card directly plugged into pcie x16 and 2 usb powered risers

Now I bought another Rx480 with usb riser

So my problem is with 4 cards plugged into Mother board PC (Win 10) does not boot...
Fans are spinning on all 4 cards
Anybody know why??

Maybe its because of PSU?
Its 750 Watt

I have to undervotlage my 4xRX480 4GB to run from a 1000W PSU. Really can't see how 750W would have a chance.

Im underclocking and undervolting so I wont have more than 550 Watts at the Wall with 4 cards.

But maybe PSU checks before booting and says 4 cards are too much? Is that possible?

No. Reinstall driver.

Reinstalled driver..but still same problem
Any idea?
Is there a Problem with amd crossfire?
Its 3 way so maybe thats the problem

Disable crossfire, useless for mining.