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There should be no reason that anything would need to be replaced if you're just installing a 1000 watt power supply however 1000 watts shouldn't be necessary for a GTX 1070. Technically upgrading to a good quality 600-700 watt 80 Plus power supply would be more than sufficient unless you're planning to someday install 2 GTX 1070's in SLi (which would also require the motherboard to be upgraded). Please feel free to call us if you have any other questions at 1.888.937.5582 Monday through Friday from 7am to 7pm PST. Please note that we are closed on Holidays.
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