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Noob PSU question.

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September 27, 2010 5:35:44 AM

I'm pretty sure that it's not the case, but if a PSU is more powerful than one's requirements - are you wasting money? a good PSU only uses as much power as it needs right? I'm well aware 850w is overkill for SLI 460s, but i'm thinking about future requirements. The xfx 850 black edition is highly rated and is in a ram combo i'm eyeballing

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September 27, 2010 5:54:01 AM

If you get a good PSU that can run all the components that you're intending to throw at it, then you're not wasting money.
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a b ) Power supply
September 27, 2010 7:35:58 AM

Your pc will only draw what it needs from a psu if all your components require 300 watts a psu will provide 300 watts regardless if your psu is rated for 400 watts or 4000 watts
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a c 91 ) Power supply
September 27, 2010 8:53:33 AM

A 2-way SLI config with GTX 460 video cards will draw a max of 300W.. Add another 200W for an overclocked CPU and other peripherals and your system won't be drawing more than 550W.. So getting any PSU (but ofcourse from a good brand) with a wattage rating in excess of that is safe and a good buy.. Although, there is this term called overkill.. The setup as mentioned will be pretty competent for few years of gaming surely.. Also, the future generation video cards might turn out to provide more performance with lesser power requirements at the similar price levels.. Thus, although its safe to buy any wattage PSU till you can afford, it might be more wise to get something which is adequate for the current setup with a decent amount of headroom for adding other components.. As such, the XFX 750W Black Edition is highly recommended.. You can do a decent saving on the price front and invest it to get a better CPU and/or more (or better) RAM.. May be even a SSD..
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a c 83 ) Power supply
September 27, 2010 2:18:39 PM

While I agree with Emperus's numbers, you need to add a bit more so that the PSU isn't running at 100% while your gaming. Not only would it be running very inefficiently, but you'll be causing it to work harder then it should. Getting what you need + 20% or so is fine. 550W *1.2 = 660W, so perhaps a nice 700W? 750W if you want to OC the GTX460s.
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a c 164 ) Power supply
September 27, 2010 2:32:07 PM

actually emperus numbers are rather conservative. a GTX 460 SLI + oc i7 set up will hit 450w during a stress test. with both GTX 460s OC along with the CPU, it will just break 500w. Gaming would obviously use less power and you won't be constantly pushing everything at 100% anyways. So with 20% headroom on 500w (600w), a continuous 650w PSU would easily do the job.

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a c 91 ) Power supply
September 27, 2010 2:37:30 PM

4745454b said:
While I agree with Emperus's numbers, you need to add a bit more so that the PSU isn't running at 100% while your gaming. Not only would it be running very inefficiently, but you'll be causing it to work harder then it should. Getting what you need + 20% or so is fine. 550W *1.2 = 660W, so perhaps a nice 700W? 750W if you want to OC the GTX460s.


i agree.. And that's the reason i suggested a 750W PSU.. My point was to keep the overkill to as minimum as possible..
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October 7, 2010 2:01:25 AM

Best answer selected by muckle.
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