We have 2 computers with AMD RX590 Fatboy graphics cards. Both had occasional but frequent freezes/crashes. I read a post that said applying better thermal paste might help. I removed the heatsink from both cards and cleaned up all the old paste. I tried Arctic Silver and was amazed at how effective it is. Since then no problems with any card. I wonder why manufacturers don't just use this material during assembly. This may not solve your problem, but I'm so glad I tried.
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