I have 3 xfx rx 470 8gb cards which have major artefacting.
If you install driver in windows you get back screen or computer freeze.
I tried tserver but it returns with gfx pipe busy.
Sometimes tserver will freeze too!
I tried dmgg.py but it report all channels and 4 memory defective.
Is this memory controller? Gpu? All memory dead?

i will try to take out first memory bank as someone suggested and see if it works...

what do these artifacts look like? Most likely it is a gpu chip.

We need more information, images, measurements and so on in order to help you.

Here are some pictures i took. I wasn’t able to make pictures until now…
It can reach windows and it has error 43
Can’t see image if i try tserver. I cannot even understand what is written.
If i boot as secondary card, i get gfx pipe busy..

That is usualy D channel. Try to reflow or reball D0 and D1 memory and see what is happening. Or try to change D0 and D1.

I know this is an old thread but it worth mentioning:
If you use amd diagnostic tool and run rx470/480 command it will not give you correct informations …
Instead you can use rx570/580 command and it will always give you the correct faulty bank…
Good luck!