Hi, may i ask what are your settings and are they the same for Ethash and Cryptonight :

1/ in bios : you modded only memory straps ? if not what max core clock and voltage, same for P3 memory state

2/ other modifications either in bios (TDP for example) or using AB, wattool or other (mem clock etc.)

In my case my settings are made directly in bios after benching the card, generally i can always set max core clock at 1080 for 900mV, but i in too much cases i cannot set the memory clock to 2000 (worse i had is 1850). Strange thing though even at 1850 mem clock i can dual at 26MH + 60 MH lbry and i usually set TDP and max W at 110 in bios, resulting in a small economy of around 10 15w
Though my settings are bad for cryptonight (i do not car for now)