Not sure if you found your answer but in general your looking at about 100mv undervolt from your cards stock voltage
on mine i run about 80mv undervolt with a 50mhz boost clock overclock and the hbm overclocked to 1200mhz with the power limit set to +20 for gaming for benchmark runs i can set the core to 1900
but if i leave the core at stock i can achieve a stable undervolt of about 120mv with the hbm at 1200mhz and power limit set to +20
hope this helps and check the radeon VII owners thread for more info
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