X570m Pro4 with 2 AMD RX 570 GPU's

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   Aloha everyone,
My system specs are as follows:

M/B - Asrock X570M Pro4
CPU - AMD Ryzen 5 3600 (w/Noctua NH-U12S)
RAM - 2x Corsair Veng. 3200MHz 16Gb (32Gb total RAM)
GPU - 2x SAPPHIRE AMD RX570 8Gb (matched)
SSD - CRUCIAL P1 NVME M.2 1Tb (In primary M.2 slot under aluminum shroud)
HDD - 2TB Seagate 7.2k rpm
PSU - ANTEC HCG 750W
ENC - Thermaltake Core V21
O/S - Windows 10 Home

I am trying to run three displays on the two GPU's.  I have 2 displays connected via DisplayPort to the primary GPU in PCIe slot 1 and 1 display connected to the other GPU in PCIe slot 2.  The issue I am having is that only one graphics card seems to work at a time.  If I plug in all three monitors as described above and restart my machine it defaults to the 2nd PCIe GPU and only one monitor works.  If I unplug the monitor from the GPU in the 2nd PCIe slot and leave the other two plugged into the GPU in the first PCIe slot, they work as dual extended displays just fine.  I have reset the CMOS, reinstalled fresh AMD GPU drivers twice, and still cannot get the third display to work.  Please help and thank you in advance.

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surfer4444 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 13 Sep 2020 Location: Merica Status: Offline Points: 3	Post Options Post Reply Quote surfer4444 Report Post Thanks(0) Quote Reply Topic: X570m Pro4 with 2 AMD RX 570 GPU's Posted: 13 Sep 2020 at 9:24am
	Aloha everyone, My system specs are as follows: M/B - Asrock X570M Pro4 CPU - AMD Ryzen 5 3600 (w/Noctua NH-U12S) RAM - 2x Corsair Veng. 3200MHz 16Gb (32Gb total RAM) GPU - 2x SAPPHIRE AMD RX570 8Gb (matched) SSD - CRUCIAL P1 NVME M.2 1Tb (In primary M.2 slot under aluminum shroud) HDD - 2TB Seagate 7.2k rpm PSU - ANTEC HCG 750W ENC - Thermaltake Core V21 O/S - Windows 10 Home I am trying to run three displays on the two GPU's. I have 2 displays connected via DisplayPort to the primary GPU in PCIe slot 1 and 1 display connected to the other GPU in PCIe slot 2. The issue I am having is that only one graphics card seems to work at a time. If I plug in all three monitors as described above and restart my machine it defaults to the 2nd PCIe GPU and only one monitor works. If I unplug the monitor from the GPU in the 2nd PCIe slot and leave the other two plugged into the GPU in the first PCIe slot, they work as dual extended displays just fine. I have reset the CMOS, reinstalled fresh AMD GPU drivers twice, and still cannot get the third display to work. Please help and thank you in advance.