MSI RX580 8GB Samsung mem can only get 28mh/s

Hi, my MSI RX580 8GB Samsung mem can only get 28mh/s. I believe it comes with original bios. I have another same exactly card running stable for 31 mh/s at:
Core clock 1150
mem clock 2100
VDD/VDDCI/MVDD 850/850/1250

The problem card can only run at:
Core clock 1000
mem clock 2050
VDD/VDDCI/MVDD 900/0/0

Please help.

it needs more than 1000mhz core clock to get full hashrate.

not stable when core clock over 950

That dont sound good. Have you checked thermal paste because you need a higher core clock to get higher speeds. 580’s need about 1100-1200 from what i have seen.

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