How many watts do I need for my gaming pc and is having too many watts for my system ok?

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Piecrust2

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Hi, I have two questions

How many watts do I need for my for my gaming pc?
Every psu calculator I use from each website tells me something different and I'm just really confused on how many watts I need for my future gaming pc. Can someone please tell me the right amount of watts I need. Here's the specs for my future pc rig:
i7 4770k (lga 1150)
2 gtx 780 (sli)
Corsair Vengeance ram 1600mhz
ASUS maximus VI hero motherboard
Western Digital 1tb 7200rpm hdd
Samsung 840 EVO 120gb ssd
Corsair ax860i

I have no clue if the ax860i has enough watts to power this pc, please guys let me if it will

Is having too many watts for my system ok?
I won't be getting both gtx 780s at the same time because it would be too expensive, but I plan on adding another one in the short future. So for the time being, would it be ok having an 800, 900, 1000 or 1200 watt power supply power a system that requires less watts?
 
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Bellaflica
I'm building a rig similar to yours at the moment. The only difference is I CAN'T SLI because my power supply is only 760 watts (AX 760). If I had bought an AX 860 as you have, I would have had the option to SLI my Superclocked 780ti.

So yes, 860 watts is enough for 780 SLI. Also, having more watts is absolutely fine, your power supply only uses as much wattage as is needed.
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Bellaflica

Bellaflica

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I'm building a rig similar to yours at the moment. The only difference is I CAN'T SLI because my power supply is only 760 watts (AX 760). If I had bought an AX 860 as you have, I would have had the option to SLI my Superclocked 780ti.

So yes, 860 watts is enough for 780 SLI. Also, having more watts is absolutely fine, your power supply only uses as much wattage as is needed.
 
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Piecrust2

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ok cool, also is 860 watts the minimum for my pc? I want some head room to work with so my psu won't over work itself. Should I go with a higher wattage?
 
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Bellaflica

Bellaflica

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http://pcpartpicker.com/p/3qT82

I put your build list into pcpartpicker and the wattage came out to just under 700 with 780 SLI, so you'll be fine with a high quality 860 watt power supply.

Edit: It certainly won't hurt to add more watts to your power supply, and you are right your power supply won't work as hard resulting in a longer lasting and quieter power supply. If I was worried about not having enough watts I would make the jump to 1000w, but it's really not necessary.
 
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Bellaflica

Bellaflica

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Piecrust2

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ok thanks for all the help :)
 
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