Can't mine with 2 gpus simultaneousy on my pc

[Neme57u]

I'm currently mining with a rx 6800 xt on nicehash miner and want to add a rx 580 8GB. The problem is, Windows does not show it. I have tried taking out the 6800 xt and then puting the rx 580 and the rx 580 is recognized. So it works. 

When i put the 580 on the main pci and the 6800 xt in the second slot, then it's the 6800 xt that does not show on Windows or nicehash.

 

When puting any of the two alone in the second slot the screen goes black, i can hear it goes to windows though.

 

My specs:

Cpu: ryzen 5 2400g

Mobo: Asrock x470 Taichi ultimate

Ram: crucial ddr4 2x8GB 3000mhz

Psu: Aresgame 850w 80 plus gold

Gpus: Asrock phantom rx 6800 xt

Asrock phantom rx 580 8GB

Ssd: nvme patriot viper vpn100 1TB

Monitor: 32" 1440p 140hz connected via dp

 

EDIT1: At some site i read that this Mobo can't use 2 gpus if the processor installed is an Apu. Incidentally i have a r9 5900x waiting to be installed.

 

 

Edited December 25, 2021 by Neme57u

[Kid.Lazer]

Have you tried disabling the iGPU in BIOS to see if that helps?

[Neme57u]

34 minutes ago, Kid.Lazer said:

Have you tried disabling the iGPU in BIOS to see if that helps?

Yeah, i tried that too.

[irishbeast]

Have you tried a riser card? I had a similar issue with my Asus B550M. 

 

Threw a wobbly when both were connected straight to the mobo but when I used a riser for the other  (I have 1 nvidia and one amd) it seemed to work. Not sure why but it fixed it

 

PSU working okay generally? Bios firmware up to date?

[irishbeast]

Oh also I found that the full nicehash would not work with both but quickminer was fine. Or it could have been the other way round!

 

This may help

 

https://www.nicehash.com/blog/post/can-i-mine-with-amd-and-nvidia-gpus-at-the-same-time