That means X3 and X8 are broken.
I switched it 4 times and the results are the same. But I haven't got new chips yet and I have to tested used ones.
I was very surprised when the card runs without X3 and X8 chip. Unfortunately it display artifacts but it works.
I feel that GPU is broken (memory controller) or it is badly placed on the PCB, because after I remove X1 chip card shows that there is no errors in this area. Moreover, i placex X1 chip to X3 and there are still errors.