GIGABYTE GA-Z97X-Gaming 3 VS ASRock Fatal1ty Z97X Killer ASUS z87-Pro

Planning to use 6 gpus with a pentium. I know some motherboards have problems recognizing 6 gpus. Will any of these work? Thanks!

I have an ASUS Z-87 PRO and at it works 6 xSAPPHIRE RX480 NITRO OC + 8 Gb.