I have a miner with 7 original RX 480 Nitros (113-2E3470U.S52) with samsung memory. Those were fantastic, ran weeks with a reboot after settling on 29.5 mhs bios found on these forums. Then one packed up and i got sent a replacement, an "upgrade" as the original non-OC was not available anymore.
this new card has Samsung memory as well but I soon realised they were vastly different in so far as:

• 256 KB bios instead of 512
• can not overclock above 2050 reliably with the memory straps from the other card, where as my other cards are running 2150
• Uses less power at the wall even though GPUZ tells me the core part is using more, so memory must be using less
• It produces at lot less heat than the original cards, probably pointing again to a lower memory voltage

This card runs for anything between 2 and 12 hours before falling over. Is there anybody with experience with it? Is it a different type of Samsung memory?
Any help or pointer would be greatly appreciated!