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the 550w psu you bought was faulty, never buy psus for 50 bucks. the hard drives were probably killed by it as well. as for psu requirements, you add up all the parts in the computer to get the requirements. a physics card doesnt eat 300w, they suggest you have at least a 300w psu for the system you put it in, not many systems should have a 300w psu though, rather at least 450w.
edit: why on earth do i have that avatar and tag? lol
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