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Thanks for the reply... Seems that, as expected, the iMac GPU is definetelly much more efficient than the lenovo CPU... is your lenovo working 24/7?
My lenovo laptop has currently 0.31 Mag just BOINcing 2 or 3 h a day...

Yes, last few days I run it 24/7 and also have Gridcoin wallet there open (for Staking to be active)
May be my Lenovo is older and I also run some other tools there