I think it's the ordinary 1660 not the super because the Super 1660 gives 30-31MH and two is 62MH but OP description is lesser , 1660 don't consume 70watt from the wall, I have one here it's Galax 1660 none super it uses 45watt in trex miner with absolute core clock and it takes 55watt from the wall, I'm guessing this is what they called silicon lottery?
Wow, it's super efficient with only 55w from the wall, I need to say I never see a 1660 with only 55w.
I had a few 1660 and super, but mine were using at least 70w from the wall
If you can, please share with us the wattage on miner or in a multimeter
My RTX is 3070 Ti and the cards I replaced with are ordinary gtx 1660, no Ti or super, they take less watt from the wall like 50-60 and yes few ones with Samsung memory takes up to 70watts from the wall.
I suspected of a 3070ti by the numbers
I know you have 1660 non super, I just wrote 1660s on the plural, with s meaning plural hehehe
As I said above, all my 1660 were Samsung memory, maybe with another brand of memory or new batches they consume less power
So your power consumption is even better than I thought, you made a good deal.