Sapphire RX 480 8GB - Stock Bios or recovery

Hi someone have this card for salle or just have and use without mod BIOS.

Sapphire AMD Radeon RX 480 8GB GDDR5

SN A1638 00034713
SN A1638 00034731
SN A1638 00034712
SN A1638 00034714
SN A1638 00034739
SN A1635 00010961

Please priv me ASAP.

I try to bet 30 Mhs at mining ETH but always when i find some topic at forum and flash bios i have problem with card SN A1635- Gpu-Z Show at all card use Samsung Memory. When i start mining after fiew h one gpu crack and rig frozen. I need to reset and start again. When i take out this card A1635 all works fine. I dont understound why. All drivers install + flash bios the same method. So where is reason to dump the card ?

There is any chance to check this card for broken RAM or somethings any diagnostick ? or meybe i need use some specyfik bios rom ?