EVGA Z270 FTW-K Initial Installation page 50

EVGA Z270 FTW – K (132-KS-E277)
6-pin PCI-E
The 6-pin PCI-E connector present on the motherboard provides additional
power to the PCI-E slots, rather than pulling it all from the 24-pin main
power. It is advised to plug in this connector when using SLI, especially with
higher-end graphic cards. It is strongly recommended to plug in this connector
for 3-way and 4-way SLI, regardless of GPU.
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