The mini-ITX Gigabyte 1070 doesn't overclock as much as a lot of other 1070s, but the ones I've got stay cool enough and work reliably and overclock pretty well.
They're REAL nice to put into a MB with 2 slots close together to leave a full-length card largely unshrouded for good cooling on both cards.
all mine will OC to above 2000mhz.. but yeh my G1 Gaming does go further.. i run at -30 tdp so max OC doesnt worry me...