Hello Miners !
Same issue here (France) with the Hynix chips.
2 weeks ago I ordered 6 x Gigabyte windforce 1060 3GB (202/each) all of them came with a Hynix chip and could mine @ 15 mh/s out of the box and 18mh/s with OC
So had to return them and ordered 6 EVGA SC 1060 3GB (238/each) i received yesterday and guess what .... HYNIX CHIPS

!!!! (same 15 mh/s out of the box and 18mh/s with OC)
Will return them today and order 6 MSI 1060 Gaming X 3GB (250/each). Hope I'll have more chance this time at the chips lottery...
If still mother F** Hynix will move to AMD or try to get some of the new Vega 64 or 56 if lucky enough.
Cheers and happy mining
Update : Received the 6 MSI 1060 Gaming X 3GB today all came with Hynix chips

OH lawd!
Not again! How is the used market in France. Maybe pick something up used that is tested. No point in buying 3GB anymore. Try looking for 6GB I think has a better chance of Samsung memory.
@ the OP:
I have the following:
1) 2x 1060 ASUS Turbo 6GB, purchase date June 2017, retailer: memory express in Canada
2) 1x 1060 ASUS dual OC 3GB, purchase date Dec 2016, retailer ncix in Canada
All have samsung memory
ETH: 23.3MH/s, SIGT 20.1 MH/s, Sia: 500-800/s easy. the Turbos are a bit of a diva though and need more coercing.
Wattage: 75-110w depending on settings
Temp: Dual OC: 70C max, Turbo: 77C.