Lower hashrate when I use 2 different gpu

Hi everybody,
I’m working with 2 gpu (1070 and 1660ti) but when both of them are mining toghether (using the default overclock and tunning) the hashrate it’s arround 50% of the average (13mh/s each gpu) If I quit one with same config the hashrate go well again.
How can I fix it?
THanks

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