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Sapphire RX 480 Nitro+ OC 8GB (11260-07-20G) can't overclock the memory or change BIOS

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Hi,

I have 6 Sapphire RX 480 Nitro+ OC 8GB ( 3 x 11260-01-20G and 3 x 11260-07-20G). I flashed the 11260-01-20G units with Jukebox's v4 bios and all work as expected; at 2150mhz I'm getting 29mh/s in Claymore 9.3.

Fab I thought, I'll flash the 11260-07-20G cards now, and that's where the hours passed me by in a blur! I simply cannot get the 11260-07-20G cards to run with the v4 bios. I have even tried to 1750 strap to 2000 and it still wont work. In fact, with the standard or modded bios the I cannot get the memory past 2000mhs without it crashing very quickly.

All of the gpus have 8G Samsung memory so I'm amazed i cant get this to work.

Has anyone seen this before? I'm totally stumped and now have expensive cards not reaching their full potential. Any help would be greatly appeciated.

Thanks.

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