Jesus I wouldn't stick any sort of graphics card in a PC with a 300watt power supply, you know that would be the things peak rating? like if it's 1 or 2 years old it's probably outputting somewhere far closer to 175-200watts now? you're really risking a major shortage and fire trying to do what you're doing there. If you are hell bent on trying to run it with that PSU definitely make sure all the USB hubs are empty of anything you can do without for the time being, even those could push that over the limit .
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