XGR? Never heard of it, could be a generic PSU. Does your video card need editional power (does it have a plug from the PSU going into it?)? Generic PSU are not know to play well with video cards, especially lower end ones. However, 450watts should be enough power for a card like yours IF the PSU is of decent quality. How are you hooking up your monitor to the video card? DVI? VGA? What type of monitor/brand is it?
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