Which one to connect in rx570 nitro

First of all I don't want to overclock. Now I am using CORSAIR vs 450. Today I just bought RX 570 nitro 4 GB version. So in the card there is two type of power connector 1 is 6 pin and another is 8 pin, as I previously said that I don't want to overclock so which one should I connect and I want to know that which one gives overclocking power to the GPU . Thanks in advance I want to know that without overclocking how much power only the PSU will draw with single power connector and by using this only one power connector will it harm my gpu or psu?????

My config

ASUS m5A7 8MLX

Phenon II x4 840

8 gb ddr3 1600mhz

corssair vs 450

2 120mm fan

2 80mm fan
 
Maybe I've slept too long, but last time I checked - if GPU has 2 power connectors - they both must be plugged in.
 
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