Cheapest 1151 mobo with a lot of pci ports?

[Drewniak30]

Hello, im looking for a 1151 socket mobo where i'll be able to put from 3 to 6 graphics cards, while suggesting tell me if i can mix nvidia and AMD here, If there is like 3x 16.0 pci-e slots and 3x 8.0 slots i can use adapters, right?

 

[theriver56]

Here is the cheapest one with 4 pci x16 slots that i found : https://www.amazon.com/ASRock-FATAL1TY-Z170-PROFESSIONAL-GAMING/dp/B017M5MI0U/ref=sr_1_12?s=electronics&ie=UTF8&qid=1498516720&sr=1-12&keywords=lga+1151+motherboard+4+way+sli

 

[MadOver]

that one is good. There's also another one from asrock that they announced in computex with tons of PCIe for mining.