2x Fury x
Asus z 170k
I am trying to add an hd 7970 but my pc always freezes before going to windows. I am using a 3.0 1x to 3.0 16x riser for the 7970. Everything except the 7970 is powered by a 1000w psu and the 7970 is being powered by a 600w psu. The riser is connected to the 1000w psu as well.
I tested the riser with an old 6670 which is powered solely by the riser and it goes to windows and is detected.
On its own the 7970 works as does the 600w psu. Also before buying the 1000w psu I was running fine with dual 600w psu.
My only idea is it has something to do with pcie lanes perhaps. On the asus website for this motherboard it says it is compatible with quad crossfire setups(Although perhaps it means 2 dual gpu like a 7990). Currently I am running fury x crossfire and mining just fine with the amd driver panel displaying 1 card as x4 and the other as x16. I cannot find anywhere in the bios to modify bus speeds. Worth noting perhaps is the 6670 only supports pcie 2.1
Looking at the manual it explains only up to dual gpu usage for pcie express operating mode. Again though the manual also says it supports quadfire.