How big should my power supply be

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skyline4727

skyline4727

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Jan 21, 2013
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I'm building a high-spec gaming rig with an i5-4670K at around 4.5 GHz (hopefully 1.3 Vcore) and 2 GTX 770s or 780s (if NVidia drops the price to compete with AMD). Either way the video cards will be the EVGA classified editions so they will be highly overclocked and pushed a little further by me if possible. I'm also going to have two HHDs, an SSD, a CD/DVD drive, and about 4 LED fans. I've used some power supply calculators online and they say that I need a minimum 650W power supply but I'm looking at an 850 just to be safe. From what I've seen in review though, a single 770 uses around 300W so two of them overclocked to 1.3 GHZ would use almost 700W by my calculations. The processor also uses about 120 so that's already over 800W and 150W more than the estimate I got online. I know that during gaming the cards don't use as much power as during benchmarks but I still want to be sure that I have enough wattage for everything.

EDIT
The power supply I'm considering is the Corsair 850W Enthusiast Series
http://www.amazon.com/dp/B004MYFODS/ref=wl_it_dp_o_pd_S_ttl?_encoding=UTF8&colid=3VPQVQYDF8TO3&coliid=I16IASMKMDJ1YR
 
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coastie65

coastie65

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May 26, 2010
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Hi There will some that will say that 850w is overkill, and most likely is to some extent. There is another consideration and that is having enough on the Rail(s) for the Video Card(s). If you go to a Corsair 850w PSU, you will have enough for sure ( I have the AX850 in here and running a single GTX 680 at the moment.
 
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skyline4727

skyline4727

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If I had the money I would, but as it is I've been saving forever for this build and I'm really trying to save money wherever i can and the PSU is a big one. I don't really need too much headroom because I don't really plan on updating the system. The only thing I would MAYBE do is get better video cards in a couple of years if the dual 770s aren't cutting it for 5760x1080 anymore and even then, Maxwell is supposed to be a lot more power efficient so I wouldn't really need the extra wattage.
 
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