I have a friend who is crazy about SnowGem 

Crank yoiur power down to 65-70 and see how stability goes. Increase by 5% until stable

it depends on your vga memory vendor
install gpuz and check if your memory vendor is samsung or hynix or micron
if you have samsung +150 core +600 memory
if you have hynix +150 core +100 memory
if you have micron +150 core +400 memory

Return your Gigabyte and get a real 1070ti.  Gigabyte cards are the dogshit of Nvidia.  You would know that if you had done a bit of reading.