Thank you for replying. I'm getting the cards at the following price:

a> ZOTAC 1070 8GB DDR5 mini $540
b> ZOTAC 1070 Amp Edition $585
c> ZOTAC 1070 Amp Extreme $615

I'm getting ZOTAC 1070 8GB DDR5 (dual fan) at cheapest. Mini is not available in the market (out of stock) right now.

According to my research on memory chip:
ZOTAC 1070 Amp Edition $585  uses Micron
ZOTAC 1070 Amp Extreme uses Samsung memory
Don't know about the mini edition.

Which card will be worth buying?