I want to buy a BT250 motherboard, connect multiple graphics card, then the power supply must choose a bit bigger, but if I now only one video card, the power consumption is a graphics card power consumption per hour, or the power of the power consumption? Such as the graphics card is 500 w, the power is 1500 w, if only one video card, which is 500 w and 1500 w power consumption per hour?

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