Yes, a 400W PSU will handle this card. This is not a power-hungry card, about 10-15W idle and 30-40W on 100% usage.
I am running a 4850 on 420W PSU (granted, it's a Seasonic which is about as far from "cheap generic" as you can get), but even that card doesn't push my power consumption to over 250W full-steam / 112W idle.


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