And you must enable compute mode also to get the full speed for the rx570. Error 43 is pixelclockpatcher, you use it wrong i think. Use DDU to uninsall all driver, reboot, install newer driver 20.9.1 or something newer, use pixelclockpatcher -> reboot. Don´t use robinhood driver, i think it cannot handle this specific version of your rx580.

I am confused you said it works on Win7 but not Win10 or do you mean other way around. If you want 30mhs with your RX 580 8gb you need to make sure you did the bios mod with the memory straps.

Then you need to install AMD drivers 16 or 17. After they are installed you use Robinhood drivers in device manager update driver option. Then when windows boots you will get that error and that is when you need the pixel patcher and it should work after that.

Make sure your clocks are correct, memory needs to be at least >1900mhz or higher. Core clock like 1100 or so. And you should get at least >25mhs.

Some miracles happen to you. In one operating system, the video card is detected and in the other not. I have rarely seen this. Check the power supply, raiser and write your hardware configuration, because it is very difficult to be psychic.
For an AMD video card, you need to install drivers that will be newer than May 2020, because the problem of a 4 GB dag file is solved there.

RX580 bios modded? did you run AMD/ATI Pixel Clock Patcher? (By ToastyX from monitortests.com)

There is no compute mode option with the AMD drivers if he is using Windows 7. The option is there for Windows 10, however for Windows 7 AMD never included that option. If he wants to use RX series GPUs and Windows 7, he needs to use the robinh00d drivers.

My advice for the prior post is, you need to install some old AMD driver version from like 2016/2017, and then go to your display drivers and click on update driver and point to the robinh00d directory and it should install. Sometimes it freezes but 5-10 minutes later it should be installed.

You might need to do this for every GPU inside your system. However keep in mind that you got a max 4 GPU limit under Windows 7.