Power Supply Requirements

[southfla79]

I'm working on a new gaming build. I'm going to start off with a Radeon 7950. I may crossfire in the future. Would a 750w power supply be enough for two cards? If so I'm going with this http://www.newegg.com/Product/Product.aspx?Item=N82E16817151087. It's currently on sale at newegg for $109.99, after all discounts are applied.

 

[geofelt]

Your link does not point to the specific psu, but I know which one, the Seasonic x750w unit.
It is a steal at that price and should power two 7950 cards.

 

[southfla79]

weird - here's the correct link http://www.newegg.com/Product/Product.aspx?Item=N82E16817151087

and thanks for the response geo!!

 

[kajabla]

Yep. Looks good. The new Radeons use very little power.

 

[Emerald]

you should be okay depending on how many other devices you are connecting. DVD plus two HDD. If you are planning on Overclocking, you might want to go up to a 850 - 1000W

single card recommends 500W with 2x 75W PCIe connectors

two cards should use about 650W

 

[ziuus1]

South, Please use this tool from Newegg to help with your selecting a psu for your system.

http://images10.newegg.com/BizIntell/tool/psucalc/index.html

You always have to account for add-ons.

 

[kajabla]

Please do NOT use that tool. Most PSU calculators overestimate, I think, to account for low-quality units. Go by actual tests: http://www.tomshardware.com/reviews/radeon-hd-7950-overclock-crossfire-benchmark,3123-20.html
In that Tom's review, a 7950 Xfire system with a heavily OCed CPU barely breaks 500W. I can't see it going over MAYBE 650W with a bunch of add-ons, so your excellent 750W unit should have no trouble.

 

[nukemaster]

I am with the above poster. /\

That newegg psu calc says 375 for my media center, yet it have never pulled 200 from the wall(about 140 watts peak with Just Cause 2). That system works fine with a 300 watt power supply

Gives 503 for my primary system that has yet to pull 300 from the wall. This system has a Corsair 850(damn its overkill)

Hell I want one of those newer Seasonic or Seasonic based units with hybrid fan since it would almost never need the fan

 

[southfla79]

Best answer selected by southfla79.