buy graphic XFX R9 270X

HI

I want to buy 8 x Graphic XFX r9 270x

each graphic full hashrate ..how much??m/h???

4 graphic r9 380x better that 8 graphic xfx r9 270x????

Hashrate 4 x r9 380x strix???m//h?



Hashrate 8 x xfx r9 270x???m/h?



which one is better for mining ETH???

HOW MUCH NEED POWER R9 380X STRIX????

HOW MUCH NEED POWER XFX R9 270X???