Take care of that PSU, with 300W you are running a risk when investing into a contemporary gfx card. It might help if you have not too many vents, LED blinking stuff and other power-consumers built into your tower. But check the new card's power demands carefully. I had to replac emy old PSU when installing three additonal vents and replacing my old GFX (AGP) card.
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If you feel nuts, consult an expert.
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