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so i have a question about power

Question asked by xxn3vinxx on Dec 19, 2015
Latest reply on Dec 21, 2015 by goodplay

i have a http://www.bestbuy.com/site/ibuypower-desktop-intel-core-i7-16gb-memory-1tb-hard-drive-120gb-solid-state-drive-black-orange/4513604.p?id=1219756376474&skuId=4513604  and i wanna buy a r9 390 or 390x  but i wanted to know if id need to buy a new power supply or an external power supply so please help

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