Which PSU is best for my setup?

[jswizzy]

Hey guys, I was wondering which psu would be better for a system that has two radeon hd6950's (unlocked shaders and overclocked to 6970) in crossfire setup and a i5-2500k cpu with a moderate overclock.

XFX 650W XXX Edition P1-650X-CAG9 Power Supply Sealed
http://compare.ebay.com/like/200592013017?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar&rvr_id=223765578391&crlp=1_263602_309572&UA=%3F*S%3F&GUID=3450b25f12f0a47a44a1f501fedcd78f&itemid=200592013017&ff4=263602_309572

XFX 650W XXX Edition P1-650X-CAH9 Power Supply Sealed
http://compare.ebay.com/like/170601897239?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar&rvr_id=223769663857&crlp=1_263602_309572&UA=%3F*S%3F&GUID=3450b25f12f0a47a44a1f501fedcd78f&itemid=170601897239&ff4=263602_309572

or

Corsair CMPSU-650TX 650-Watt TX Series 80 Plus Certified Power Supply
http://www.amazon.com/Corsair-CMPSU-650TX-650-Watt-Certified-Supply/dp/tags-on-product/B000X24ISU

 

[davcon]

The XFX units are more efficient and feature modular cables.
Any one of those units would be fine.

 

[Uther39]

Whats your budget as personaly for your system i would be thinking of something with a little more Wattage,

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021

CORSAIR Enthusiast Series TX750 V2 750W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply

 

[Uther39]

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207003

XFX Black Edition P1-750B-CAG9 750W ATX12V v2.2 / ESP12V v2.91 SLI Ready CrossFire Ready 80 PLUS SILVER Certified Modular Active PFC Power Supply

 

[jswizzy]

Uther I heard its not about total wattage. It's about the amount of amps put out by the 12v rail. For instance some 750 w psus are worse than 650w psus and some 500w psus are worse than 450w psus.

I could be wrong though. Please correct me if I am.

 

[Deleted member 217926]

You are correct in that not all power supplies are equal and it is about 12v amps. However I think you are pushing it trying to Crossfire unlocked 6950s with 650 watts. I would recommend a 750w unit. That XFX unit that Uther linked to is a great choice.

 

[jswizzy]

Different thread, but once again...

I love you.

 

[Deleted member 217926]

Seriously, I usually at least get dinner and a movie before the I love yous start.

But once again , glad I could help.