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How much power should a system with 4 undervolted rx 480 Sapphire 4GB cards use?

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Hey guys,

I have a rig with 4 Sapphire 480 4GB nitro+ cards. I ve managed to undervolt them and get them to use around 100w each at 1144/2150 clocks. However, my measuring device shows the entire system draws 720w at the wall. I have CPU Intel G1820 and H81 MOBO and somehow I feel my result s too high by about 100w, that this system should use 600-620w max. What r your thoughts? Is the current result OK? If not, what should I take a look at?

Thx a lot

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