Need help finding a PSU

[qakers]

I'm getting ready to purchase the parts for a new gaming PC. I have everything picked but I'm not sure about the power supply.
The main components are:
i5-2500k
HD 6870
8 GB DDR3
Asrock z68 extreme3 gen3 mobo

for the PSU I was going to go with

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371044

until someone suggested

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151095

I prefer the modular design which not even the antec ea 750 watt offers so I'm leaning toward the Seasonic but
I want to have enough power for another 6870 down the road and possible overclocking. I know amps and rails
are more important to how much power a PSU can provide but I don't know what to look for their so I came here
to ask.

Will won of these be enough for what I need or should I look for a 700 watt?

 

[Emerald]

either one will do for your current setup; however, since you are considering overclocking and running dual GPU I would suggest you get a 850W PSU

 

[kajabla]

I'd go with 650W for two 6870s. Emerald, you definitely don't need that much.
If you really want modular: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139031
Otherwise, take the Antec.

 

[ko888]

For a system using two Radeon HD 6870 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 600 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 46 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

So far none of the power supplies mentioned have at least four PCI Express supplementary power connectors.

The following semi-modular power supplies will work:

CORSAIR Professional Series HX650 (CMPSU-650HX) for $109.99 ($89.99 after mail-in rebate card)
• OEM: Seasonic
• +12 Volt continuous current rating of 52 Amps
• four (6+2)-pin PCI Express supplementary power connectors

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


Seasonic M12II Bronze Series 650W (SS-650AM) for $119.99
• +12 Volt continuous current rating of 53 Amps
• four (6+2)-pin PCI Express supplementary power connectors

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151106

 

[kajabla]

Clever. Right.

 

[qakers]

For a system using two Radeon HD 6870 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 600 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 46 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

So far none of the power supplies mentioned have at least four PCI Express supplementary power connectors.

The following semi-modular power supplies will work:

CORSAIR Professional Series HX650 (CMPSU-650HX) for $109.99 ($89.99 after mail-in rebate card)
• OEM: Seasonic
• +12 Volt continuous current rating of 52 Amps
• four (6+2)-pin PCI Express supplementary power connectors

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


Seasonic M12II Bronze Series 650W (SS-650AM) for $119.99
• +12 Volt continuous current rating of 53 Amps
• four (6+2)-pin PCI Express supplementary power connectors

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151106

Would the 650 antec EA or the Corsair mentioned in the posts above not work?

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371051
There is also this.

 

[kajabla]

No, they would not. That Antec 750 and ko888's two are the only ones so far that'd work. The PSU must have four PCIe connectors. You can check in the Newegg details.

 

[ko888]

It's easier to find power supplies with four or more PCI Express supplementary power connectors with power supplies that are 750 Watts or greater.

 

[qakers]

Someone told me I could get another PCIe connector with the modular psu's, is that true?

 

[kajabla]

Maybe for some, but I think most should come with cables for all of their available ports.

 

[BoSSYojimbo]

Toughpower 850 is a sick psu. I currently have 1 in a very similar rig

 

[qakers]

Best answer selected by qakers.