i dont see 134mhz more overclock to boost giving it 20-30% performance to matcha stock 1070, they would need a lot more than that, and to be honest i dont see the card going to 1800+mhz while being released with 1080 base clock
It doesn't have to perfectly match a stock 1070 at 1400; if its within 5% with such a small OC - means the rumored Beast Mode cards would easily match and pass stock 1070s for less money......and possibly less power....