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They are failing one after the other. First by producing a rattling noise for a few days and then dying completely.
...
Same thing here with the Gigabyte RX 570... i still have some RX470 XFX and Asus 1 year older mining on the same room... without any problems...
Damn Gigabyte Fans... :/
And didnt found any cheap source, aliexpress, ebay, anywhere... they are all expensive...