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Power supply requirements for nvidia 780 GTX

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I currently have a 780 GTX in my PC and I am thinking of upgrading to a 980 ti and building a second PC for my daughter and using the 780 GTX.

Any recommendation of wattage for the power supply please? I have a 850W corsair in mine and will be building a mini ITX one for my daughter. I also like to have more than enough power.

The resale value of my 780 GTX would only get me a brand new 960 so I might as well keep hold of it.

I have a budget of £60 to £90 for the PSU.
 
£60 will see you a 650 watt superflower psu. Thats the way i would go. A good 500 will do you fine however nothing wrong with having a little head room for upgrades later.
 
You want 600w as a comfortable minimum. A 500w or 550w would just about do it but leaves you none to little overhead. My pc has a peak power draw of 452w at the wall and hits a max of 422w while gaming. That is too close to a 500w psu's max power for my liking. If you already have a 850w Corsair then use that.
 
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