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Do I have to use the 4 pin AND 8 pin ATX power connector from PSU to Motherboard?

post #1 of 2
Thread Starter 
I'm building a CPU for the first time and I was wondering if I need to run the 4pin AND 8 pin ATX power connector from the psu to mother board (A and B in the diagram)? Seems redundant that you would need to run power from the PSU to motherboard twice... Althought the manual does say I also need to use the 4 pin EZ _PLUG when running two graphics cards.

Motherboard: ASUS Crosshair V Formula-Z AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard
CPU AMD FX-8320 FX-Series 8-Core Black Edition Processor
GPU (2) Sapphire Radeon R9 280 3GB GDDR5 DVI-I/DVI-D/HDMI/DP Dual-X with PCI-Express Graphics Card Boost
PSU EVGA SuperNOVA 1300 G2 80+ GOLD, 1300W Fully Modular
RAM (2) Corsair Dominator Platinum 16GB (2 x 8GB) DDR3 2400MHz


post #2 of 2
You only need to plug in the 8-pin at the top for the CPU. The 4-pin at the top is to give it more power when you are overclocking with liquid nitrogen.

The bottom 4-pin molex is for 3-4 graphics cards. I'v never needed it for two.
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