I have already counted everything with power supply calculator. In maximum loads, my system with RTX 2070 uses 399 watts. I have be quiet! Pure Power 10 500W CM (80+ silver, maximum load 550W). My system : sataIII ssd 120 gb, 16 gb ram DDR4, i7-7700k, 3x 120 mm fans, two external devises (usb...