Help choosing adequate psu

[starkilling]

So I am building a new system and I don't know what psu to choose:

MSI P67A-GD65
i5 2500k
AMD 6950 dirt 3 special edition
2 hdds, 5x120mm fans

I want to overclock everything. I'm not sure about crossfire for now so I'd be great if you'd reccomend a psu if I want crossfire and another where I dont.

Thanks!

 

[rolli59]

For a single card system Antec BP550 http://www.newegg.com/Product/Product.aspx?Item=N82E16817371016
For crossfire XFX 750 http://www.newegg.com/Product/Product.aspx?Item=N82E16817207016

 

[farrengottu]

650W should be your minimum but i would get at least a 750 just to not stress the power supply as much. helps them last longer.

 

[Pilk]

I would recommend the Corsair AX650 also based on its 80 plus gold award wonderful power supply also should be ample enough to run your configuration.

http://www.corsair.com/professional-series-gold-ax650-80-plus-gold-certified-fully-modular-power-supply.html

 

[casualbuilder]

The Corsair HX750 is also nice, and only $140 on newegg. I run it in my system, and should be able to handle even another GPU if you want. If you are running a single card, that AX650 Pilk listed is a little overkill, but well worth the money. Again, the less you stress your psu, the longer it will most likely last, especially with good airflow/cooling.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010

 

[Pilk]

generally i like to recommend 80 Plus gold certified PSU as they are extremely efficient, but can be very pricey in the long run this is true.