What?
Thing draws 250 W max,
CPU is 125 -95
Not much else draws power, so the whole system should be 400 W or less.
Must be one terrible PSU if it can't produce that yet its rated for higher.
How many other electronics are you running on the same breaker?
Find reviews of the PSU where they bench test the unit, not one of those "i installed it, it ran my awesome computer and was 'quiet'" things.