turn down power of graphics card

http://forums.cnet.com/7723-7591_102-259018/350watt-graphic-card-in-300w-power-supply/

this thread is the most informative, but there are a lot of hits for this here:

https://www.google.com/#q=Is+a+300w+power+supply+enough+to+run+a+350w+graphics+card

A card is designed to work at a certain level, you cannot change it, and to use the card with a lower rated power supply, would most likely cause some heat problems, as you can read in some of the threads above.

As a power supply is not very expensive you might just purchase a new one and ensure it is compatible with your pc and will fit your case.
 
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