Is my PSU adequate for a GTX 1070?

Yeah unless Dell really screwed something up with that thing you should be perfectly fine. Check if you have the necessary PCIe cable for the 1070. Should be an 8-pin cable. If you don't you can always use a converter cable (just make sure it's not some cheap crap, make sure it is 18 gauge or lower).
 

abe65

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Jun 24, 2015
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Thanks for the reply! I'm currently using a GTX 780. Will the cables I use for that be fine?