Out of these, which would be best for better overclock? How to know what their power phases are?
ASRock Extreme4 Z97 https://jet.com/product/ASRock-Z97-EXTREME4-LGA1150-Intel-Z97-DDR3-Quad-CrossFireX-and-Quad-SLI-SATA3and/934b4d867fbd49db98a70b7f404570ad
ASRock FATAL1TY Z97 KILLER https://jet.com/product/ASRock-ATX-DDR3-1333-LGA-1150-Motherboards-FATAL1TY-Z97-KILLER/b0dc31ebdeb145559ecc053ca75498e7
GIGABYTE GA-Z97X GAMING 7 https://jet.com/product/GIGABYTE-GA-Z97X-Gaming-7-LGA-1150-Intel-Z97-HDMI-SATA-6Gbs-USB-30-ATX-Intel-M/eaea060dcb2b4741879c3016b1aa4e0f
ASRock Extreme4 Z97 https://jet.com/product/ASRock-Z97-EXTREME4-LGA1150-Intel-Z97-DDR3-Quad-CrossFireX-and-Quad-SLI-SATA3and/934b4d867fbd49db98a70b7f404570ad
ASRock FATAL1TY Z97 KILLER https://jet.com/product/ASRock-ATX-DDR3-1333-LGA-1150-Motherboards-FATAL1TY-Z97-KILLER/b0dc31ebdeb145559ecc053ca75498e7
GIGABYTE GA-Z97X GAMING 7 https://jet.com/product/GIGABYTE-GA-Z97X-Gaming-7-LGA-1150-Intel-Z97-HDMI-SATA-6Gbs-USB-30-ATX-Intel-M/eaea060dcb2b4741879c3016b1aa4e0f