thanks for answers!! I'm from east Ukraine. Ebay: ~89,99$ cost of motherboard and $43,32 is lower cost for delivery, too expensive, will try to find in local stores and maybe find one of H81.
what power supply can you recommend? Think about Corsair CX750M + Corsair CX850M. 
I bought raisers with molex/v5

Hello everyone! Want to build my first rig on 6*rx470(sapphire nitro+), but don't know how to choose motherboard. More cards didn't see 6 GPU and have more problems with compatibility (especially z170 series). Can you help me find some information?
(ASRock H81 PRO BTC R2.0 isn't on sale in my country, also it's very hard to find through the internet>with delivery on EU)
variant1 ASRock Z270 Killer SLI
variant2 ASRock Fatal1ty B250 Gaming K4
variant3 ASRock Z97 Extreme4