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Enough PSU power for my system?

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  • Power Supplies
  • Power
  • Components
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Last response: in Components
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September 13, 2012 2:15:07 PM

I plan on getting the following PSU...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

...will this provide enough power for my build? I also plan on buying two GTX 660 ti or AMD HD 7950. I WILL be moderately overclocking both my graphics card and CPU.

More about : psu power system

a b ) Power supply
September 13, 2012 2:29:45 PM

What's your build? That PSU has 4 PCI connectors so the 660's or the 7950 will not be a problem to plug in.
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September 13, 2012 2:34:03 PM

CPU - i5 2500k @ 3.3GHz
Motherboard - ASRock Z77 Extreme4
SSD - Crucial M4 128GB SSD
Case - Cooler Master HAF 922
Memory - G.SKILL Ripjaws 8GB
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a b ) Power supply
September 13, 2012 2:38:56 PM

Yeah, 750W is fine. My system pulls ~250W at max usage so yours is fine.
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September 13, 2012 2:48:15 PM

Hmm so what I have is overkill? Even with two overclocked graphic cards and an overclocked CPU?
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a c 158 ) Power supply
September 13, 2012 6:07:31 PM

Yes, that PSU will easily be sufficient for your build plus OCs.
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September 13, 2012 6:14:09 PM

arcticle said:
Hmm so what I have is overkill? Even with two overclocked graphic cards and an overclocked CPU?


You want a power supply that will not be loaded 100% either. I would say stick with the 750, then if you want to add something you don't have to worry about hitting the ceiling of the power supply.
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a c 158 ) Power supply
September 13, 2012 6:47:16 PM

In a 2-way Crossfire HD 7950s consumed 279W and in a 3-way Crossfire HD 7950s consumed 411W: http://www.guru3d.com/article/radeon-hd-7950-crossfire-... Add another 100-150W for the rest of the system; the HX750W is electrically sufficient for a 3-way Crossfire. The Corsair CMPSU-650HX that is made by Seasonic and has four 6+2pin PCIe cables is actually sufficient for a 2-way Crossfire of HD7950s. The GTX 660ti has basically the same power consumption....if the PSU works for one, then it is good for the other.

Edit: Changed a reference to SLI to read Crossfire.
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a c 158 ) Power supply
September 13, 2012 6:59:53 PM

The CMPSU-650HX's capacity on the 12V rail is 624W. Assuming the rest of your PC consumes 150W (unlikely), then the full load power draw (279W+150W = 429W) is under 70% of the HX650: 429W / 624W = .6875 or 68.75% Operating a quality PSU at this load is imminently safe and is actually in the typical PSU efficiency 'sweet spot' between 40-70%. If the rest of your system uses 100W (more likely) then you hit around 60% capacity of the PSU at full load. Again, that is a very safe range to operate your PSU.
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September 13, 2012 11:45:37 PM

Best answer selected by Arcticle.
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September 13, 2012 11:45:43 PM

Thanks!
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a c 158 ) Power supply
September 14, 2012 10:05:40 AM

Glad to help!
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a b ) Power supply
September 14, 2012 6:57:54 PM

This topic has been closed by Mousemonkey
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