GTX 1070 and PSU Question

[Scremin34Egl]

So I have an Arctic Cooling 550RF power supply and I currently own a gtx 660. Looking to upgrade to a gtx 1070. So the power supply outputs 34A on the 12V rails which is 408W. I used the PSU calculator and it calculates 29A on the 12V rails with all my components PSU calculator link

Would it be cutting it too close ?, Although i'm guessing that calculated value is the maximum I can pull and under gaming it should be less

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[Dunlop0078]

Yeah you will likely be pushing those 12v rails, however the 1070 does not use all that much more power than a 660 so it will probably power it. Question is would I trust a psu like that to power a 400 dollar 1070? No I would not. It was not very good when it was new in 2010 and by today's standards its even worse. Regardless of it having enough power I still wouldn't trust in in a modern high end system with a 1070.

Here is a review of that psu from 2010, not very good: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=209

 

[xapoc]

1070s have like 150-200 tdp, not sure hows the rest of your systems tdp but they want you to have 1.5x the amount of power head room when running whole PC. So cpu, gpu, ram, hdd's and other small things will add up to pretty much ~350W? wild guess. Less in idle perhaps. So ideally you want 600-750W quality psu to play safe. Also if you overclock hardware that's another thing to add on top of it so yeah.. will it work? likely yes, but there is no guarantee some component will snap and pop, shorting out your new GPU and frying something else along the way in the long run.