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I have 12 gpus gtx 1060 3g asus dual all same brand , on ethash only 4 of them works on 18MH/s the rest of them works on 15MH/s , don't know why they are all same brand asus dual , anyone know how to fix this or an overclock can fix this

overclock cards. Which Memory type is on the cards? Look at GPU-Z
A little bit more information is very usefull: Which miner, which nvidia driver and so on.

Is it possible to have this results because of memory brand (the one with 15Mh/sec to be Hynix) and the other ones Micron.
Install GPU-Z and let us know what kind of memory is installed on the cards, also what OC do you do on them?

I still have a couple of Asus dual fan 1060/3GB cards mining MUSIC and getting 21MH/s out of them with 70% power limit and a very modest +200 on memory clock (no change to core clock). They have Samsung memory, though.

Then you can easy max them to 25 MH, add +700 to clock

I want to do some overclock to the hynix, which are the 8 cards pulling 15mh/s , so to get 18 or 20 mh/s is it possible?

You should be able to get 18-19 from the Hynix overclocking the memory.
Raise the memory clock to 9100 MHz and share the results with us.

i think go to mine other algo can make profit more than eth for 1060 3g

With Micron I jump between BTG, ETH and Monero currently.
With slower memory I cannot see how ETH would be relevant to mine today (other ethash coins might be profitable some minutes per day).

Should i play with the power ratio?

With power you should play with [-] put it at 65 or 70%
BTW what OS/mining software are you using?

Check this thread NVIDIA GTX1060 3GB OC Settings - 23.08 MH/s (https://bitcointalk.org/index.php?topic=3073141.0)

Other said Samsung memory can hit 18-19mh/s or 23mh/s at 4700MHZ and for Hynix you can reach 15mh/s to 18mh/s at 4250mhz

Try increasing the memory without editing the power ratio and reduce core clock a bit.

After raising the memory clock +550 i am able to pull out 19MH/s solid