Should I get a new power supply for my Radeon HD 7770

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Nov 22, 2014
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Hello, i have been recently debating to get a new video card with the upcoming black friday and on newegg i saw a deal for the radeon 7770 for about 85$ with 20$ in rebate. I figured it was a good deal for my computer.
Some info on my computer. My computer isn't custom built and i bought it in a store. The specs of my computer can be found here. http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03782923&cc=us&dlc=en&lc=en

I have built custom computers before and if you're wondering why this computer is so "crappy" its just a small side project of mine. Anyways my question is do i need to upgrade my psu if i do get the video card? The power supply says it runs at an average of 260 w and maximum is 300w. Would i need to upgrade it or anything else in my computer? Would it be bottle necked by my cpu or vice versa?