I got a 3gb gigabyte WF2OC with Hynix. Check on the serial number should start with 16xx or 17xx. The first two digits is the year and XX is the week. The earlier batches of 2017 might still have micron or samsung but not the newer ones imo.
Gigabyte WF2OC, 2 units, SN starts with 17xx - both Hynix.
Purchased in Q3 2017.
It seems only mining edition of GTX1060 carry Samsung memory.