Need to calculate PSU size...

[JordanMac]

get a 650-750 watt psu, make sure it has a single 12v rail not multiples rails and buy a good brand like seasonic, corsair, antex etc. don't cheap out on your psu.

[mgsstar]

A XFX Core 650W/Corsair HX650/Seasonic X650 will be able to power your build.

[skitz]

But make sure you get enough amps in the 12 volt rail for the new nvidia cards.. I believe the needs at least a 42 amp 12 volt rail..wattage means nothing if you got a 700watt psu with only 35 watts on 12volt..but no one ever mentions that.. They just say get a 600 watt. Lol

Thanks for that, could you suggest any PSU to have with a 780 GPU with a haswell i5 4670k?

[OneGun]

Thanks for that, could you suggest any PSU to have with a 780 GPU with a haswell i5 4670k?

This one would be the one I would buy.. I've had good luck with the corsair power supplies I have had..

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139012

It's $109 after rebate..

[WoodenMarker]

Still doesn't excuse the fact that Corsairs CX line is there budget line of power supplies. Furthermore the OEM within the CX power supplies is cheaper quality than if you were to go out and get a TX, HX or AX power supply. 

The 'cheaper' quality is more than enough.

 

A decent 500-600w bronze would be plenty.

http://uk.pcpartpicker.com/part/xfx-power-supply-p1550sxxb9

[quan289]

Thanks for that, could you suggest any PSU to have with a 780 GPU with a haswell i5 4670k?

 

This would be more than plenty:

http://www.i-tech.com.au/products/137306_Seasonic_G_series_550W_PSU_80Plus.aspx

http://www.itestate.com.au/pages/product/pdt_product_detail.faces?BeanName=productDetailAction&pcode=16156

[Exo]

My 660W PSU is more than sufficient for my Haswell CPU & GTX 660 (it probably draws more power). My 660W PSU is set to hybrid, meaning it turns on the fans only when the PSU wattage goes above 500W - which it never has, even taking into the consideration my GPU is factory overclocked! Even if you were to overclock the CPU to the max, you would be fine..

[calarahil]

The 'cheaper' quality is more than enough.

 

A decent 500-600w bronze would be plenty.

http://uk.pcpartpicker.com/part/xfx-power-supply-p1550sxxb9

 

Sure the wattage will be enough. I'm not debating that. What I am debating however is the quality of the unit. Power Supplies there quality far out reaches what there wattage says on the box and my point really was just to illustrate that taking the time to find a quality unit with a quality oem is a good idea because just because a unit will work today does not mean it will work tomorrow and when you spend 400 dollars+ on a graphics card but are only willing to spend 40-50 dollars on a power supply something should be said for that. 

[KneesWeak]

you dont even need 600w, with haswell you could easy get away with 450w. everyone goes overkill with psu's

its not about getting by