<< Solved >> SMBIOS - iMac19,1 RX580 dual display Catalina

[power911]

Hello! I've a question. Here is my hardware list:

Intel Core i9-9900K, 3.6GHz, 16MB
Asus ROG Z390 MAXIMUS XI CODE
SSD Samsung 970 PRO 512GB PCIe x4 NVMe
SSD Samsung 850 Pro
sapphire Radeon RX 580 NITRO+ 8GB
Noctua NH-D15
SeaSonic Prime Platinum 1300W
Ballistix Ballistix Sport LT, DDR4, 32 GB,3200MHz, CL16

I updated OS to Catalina. When i set SMBIOS to iMac19,1 only monitor via HDMI works.. The second one (main) via DisplayPort doesn't work.

Any ideas how to resolve it?
Here is my config.

 

[power911]

Anyone?

 

[henrikolsen]

I see you (@power911) use the same graphic card as I do.

Could you please report what power usage and temperature you see in your system when they have settled in at idle usage?

See

gpu temperature info rx 580 8gb

My RX 580 does not use over 100W during non-gaming usages, on both of macOS and Windows. I don’t understand why yours would consume so high which is really abnormal. I use one single 4K display.

www.tonymacx86.com

 

[MacNoobie]

How did you solve it?