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Psu anxiety

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a b ) Power supply
January 9, 2012 7:41:28 PM

Im in the early stages of my build . My case came today ( lian li pc-a70f ) . Im now shopping for a psu . I've read all the info I could find on the subject and although it was very informative I'm still at a loss as to which unit to go with . Im going with a i5 2500k cpu and asus p8z68 mobo and one large video card ( to start ) . I plan to go sli later . According to some of the reference material I read an 850w psu would do . I dont need modular as I have no side window and led's not neccessary . The single or multiple 12v rails / ocp / bronze silver gold , 80+ etc. choices I leave to your collective wisdom . In short , choose a psu for me ! ty

More about : psu anxiety

a b ) Power supply
January 9, 2012 8:41:46 PM

Antec CP-850 - $115
XFX pro850 - $90 after rebate
Corsair TX850 - not in stock at newegg
Antec High Current HCG900 - $130
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a b ) Power supply
January 9, 2012 8:58:31 PM

cool ty . I was just looking at a Rosewill RBR1000-m 1000w . good bang for the buck or risky investment ?
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a b ) Power supply
January 10, 2012 2:07:50 AM

I have an Antec HCG-750 and a Rosewell Capstone 750 on two of my computers. I tend to be more impressed with the Rosewell unit. I haven't read anything about the RBR. That one and the Capstone series are built by two different OEM's.
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a c 1167 ) Power supply
January 10, 2012 3:44:22 AM

rufus_22 said:
cool ty . I was just looking at a Rosewill RBR1000-m 1000w . good bang for the buck or risky investment ?

A good 1000W power supply will have a combined +12 Volt continuous current rating of 83 Amps.

The Rosewill Bronze Series 1000W (RBR1000-M) has a combined +12 Volt continuous current rating of 75 Amps. The OEM for this power suplly is Sirtec and has a three year warranty. Rosewill's Bronze Series is in their low-end offerings.

The Rosewill Capstone Series models all use Super Flower as its OEM and has a five year warranty and would be considered Rosewill's high-end offering.
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January 10, 2012 8:09:08 PM

Thermaltake has a pretty good PSU calculator if you wanted to see how much of a PSU you actually need. You may be surprised at what you actually require for wattage. It's easy to say "oh drop in a 1000w PSU," but if you don't need it you'll just be wasting money.

http://www.thermaltake.outervision.com/
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a c 1167 ) Power supply
January 10, 2012 8:32:17 PM

AMutedScream said:
Thermaltake has a pretty good PSU calculator if you wanted to see how much of a PSU you actually need. You may be surprised at what you actually require for wattage. It's easy to say "oh drop in a 1000w PSU," but if you don't need it you'll just be wasting money.

http://www.thermaltake.outervision.com/

That's the eXtreme Power Supply Calculator Lite available right from its developer:

http://extreme.outervision.com/psucalculatorlite.jsp

They even warn you about the wattage that the calculator recommends:

The recommended total Power Supply Wattage gives you a general idea on what to look for BUT it is NOT a crucial factor in power supply selection! Total Amperage Available on the +12V Rail(s) is the most important, followed by the +5V amperage and then the +3.3V amperage.

You have to pay for the use of the eXtreme Power Supply Calculator Pro version which displays the necessary Amperage data.
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a b ) Power supply
January 12, 2012 1:46:31 AM

Thanx for the link . I put in all my info including the eventual sli and oc and was surprised to see that the calculated usage was only 635 . With that in mind I broused newegg again and found a Silverstone st85f-g 850w ( a little headroom ) . your thoughts ??
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January 12, 2012 2:41:42 PM

If you've got the money that's a nice power supply. A quick breeze through the interwebs show's good reviews. 70amps will be more than enough for most SLI applications. Having a single rail I see as a plus too, as you're not having to worry about splitting load evenly. If you're wanting to save 20 bucks, Corsair's TX850M goes for 140$, though it's 80+ Bronze, not gold. Honestly I'd spend the extra up front for the extra savings and life down the road.
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a b ) Power supply
January 12, 2012 6:33:29 PM

thanx for the feedback ,however I revisited the calculater today and noticed I missed a couple fields ( oops ) and the revised max usage is 856 w . Soooo I need to bump up to 950 or 1000 to have any headroom ( argh) so I'll have a new pick to throw before the jury soon .
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a c 243 ) Power supply
January 12, 2012 7:37:29 PM

rufus_22 said:
thanx for the feedback ,however I revisited the calculater today and noticed I missed a couple fields ( oops ) and the revised max usage is 856 w . Soooo I need to bump up to 950 or 1000 to have any headroom ( argh) so I'll have a new pick to throw before the jury soon .

Be a hell of a trick if that's what it told you , reread ko's second post , oh nevermind I'll paste it up
" The recommended total Power Supply Wattage "
Not usage, a wattage reccomendation, adding to it is only for your own piece of mind , not really neccessary.
You must have input a fairly high end system to get that kind of reccomendation, pair of 580's ?
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a b ) Power supply
January 12, 2012 7:59:16 PM

Yah I was surprised too. My eventual build is as follows : lian li pc-a70f , psu to be determined , i5 2500k , ssd x1 , mechanical hard drive x1 , corsair vengence x 16g , msi 560ti x2 , asus p8z68pro , 8 casefans , odd to be determined etc . Not that aggressive a build so yah I'm at a loss to explain the high power req .. Your thoughts plz

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a c 1167 ) Power supply
January 12, 2012 8:35:29 PM

rufus_22 said:
Yah I was surprised too. My eventual build is as follows : lian li pc-a70f , psu to be determined , i5 2500k , ssd x1 , mechanical hard drive x1 , corsair vengence x 16g , msi 560ti x2 , asus p8z68pro , 8 casefans , odd to be determined etc . Not that aggressive a build so yah I'm at a loss to explain the high power req .. Your thoughts plz

When plugging in the components you've listed this is what I see:

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January 13, 2012 1:41:30 AM

850watt is all your'll need.

Look at CPUs and GPUs. Intel CPUs are pulling under 120watts peak at the wall, 40nm GPUs are pulling around 240watts peak and 28nm are pulling around 180watts peak.

If you OC'd a cpu and assume 120watts and OC a GPU and assume 300watts, that's only 420watts.

850 is fine. I personally aim for ~750 just because it'll typically run more efficient in my power-draw range.
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a b ) Power supply
January 13, 2012 2:23:14 AM

Awsome . thanx for the info . I can save a little coin on this part . I'm gonna likely go with the Silverstone ST85F-g 850w .
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a b ) Power supply
January 15, 2012 11:44:02 AM

Best answer selected by rufus_22.
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