EVGA Z370 FTW User Manual page 44

EVGA Z370 FTW (134-KS-E377)
6-pin PCIe
The 6-pin PCIe connector present on the motherboard provides additional
power to the PCIe slots, rather than pulling it all from the 24-pin main
power. EVGA strongly recommends plugging in this connector for 3-way, 4-
way, and Quad SLI, regardless of GPU. Although the Z370 FTW does not
support 3-way or 4-way SLI, connecting a 6-pin PCIe connector is
recommended if running two or more high-end graphics cards in SLI, or
running multiple cards in a high-performance environment, such as
Folding@Home, crunching, or mining.
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