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Old 01-25-2013, 08:26 PM   #1
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Default Power Supply Calculator

this should probably be sticky'd

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Old 01-26-2013, 04:09 AM   #2
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What for? There are plenty of PSU calculators out there that are not stickied. I don't see how this Asus calculator is any better, in fact it seems to have fewer options than Thermaltake's calculator, for instance. It seems to overestimate the needed wattage to compensate for bad quality units, just like all the other calculators.

Also, wattage isn't everything. What's more important is the amount of amps on the +12V rail(s), the number of connectors needed for your graphics card, and the quality and reliability of the unit.

Last edited by lehtv; 01-26-2013 at 04:12 AM.
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Old 01-26-2013, 05:03 AM   #3
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The PSU calculator is slightly flawed. I matched the my specs and the calculator churns out a 400W requirement. Definitely could do with less but I find it fair as most PSUs that I purchase is a minimum of 500W. What's flawed is when I add in a single HD7970 and the wattage shoots up to 700W. You certainly do not need that much for a HD7970, realistically 550-600W is plenty.

The hilarious part is that the calculator allows me to account for two Core i5 3570Ks. I'd wish.
Intel Core i5 3570K [4.5GHz @ 1.28V]|MSI Z77A-GD65|Samsung MV-3V4G3D 16GB 1866MHz@9-9-9-24/1.35V|Powercolor HD4650|Corsair Force GT 120GB|Samsung F3 1TB|Corsair CX500|Corsair 400R|XSPC Raystorm + XSPC EX240 + EK DCP 4.0
Intel Core i7 2600|ASRock H61M/U3S3|Kingston HyperX 8GB|Intel HD2000|WD Blue 320GB|Samsung F4EG 2TB|WD Green 2TB|WD Green 3TB|WD Green 3TB|FSP SAGA II 500W|CM Elite 343
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Old 01-26-2013, 06:20 AM   #4
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The Asus one is one of the worst ones, for certain. Gave a system that runs fine on 520W PSU an 800W as recommended, instead. Hmm, come comes? Aha... Asus makes PSU as well. Make your conclusions, gentelmen.
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Old 01-26-2013, 07:07 AM   #5
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PSU calculators (all the ones I've seen) are fatally flawed. The only way of making them vaguely accurate would be to make a short list of decent PSUs / brands of PSU and run the tests using those, and have a disclaimer of "if you're not using a PSU on this list, you may as well be using a ouija board to calculate the answer to your question".
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Old 01-26-2013, 01:26 PM   #6
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XD said my pc requires 700W when it doesn't even break 600W barely 550W

Last edited by Durvelle27; 01-26-2013 at 01:31 PM.
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Old 01-28-2013, 02:34 PM   #7
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fair points. perhaps a list of all the calculators, since a majority of posts here seem to be about needed wattage.
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Old 01-28-2013, 03:42 PM   #8
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None of the calculators are useful enough to be stickied. All of them estimate (or should I say overestimate) the PSU wattage, none of them calculate actual peak power consumption. Perhaps instead there should be a sticky with information about how to judge how much power your system uses, how to decide the PSU wattage needed, and whether a particular PSU is worth buying or not.
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Old 02-05-2013, 02:14 PM   #9
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Some time we can't use it without electricity
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Old 02-05-2013, 06:37 PM   #10
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Lol, that calculator added 200 watts for an HD7850 card, which is a 105w card.

It says I need a 550w supply for my system, which draws 200w from the wall when fully loaded.
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Old 02-05-2013, 07:21 PM   #11
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An i3/i5 pc with a 7850 won't take more than 200-220W peak while gaming, (more in furmark). The online calculators overestimate the power requirements alot.
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Old 02-05-2013, 08:28 PM   #12
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ASUS: 400W
Thermaltake: 356W

Actual PSU: 750W
Peak usage: about 270W (hypothetical since I actually haven't measured)

Result: power usage calculators fail, but are accurate enough in my case, re-confirmed my over-powered PSU. (cheap, matched color scheme, don't care)

Edit: MSI's calculator is pretty close (assuming "stock").
Power-On's isn't... though it doesn't have my CPU/GPU either, but it's way off.

Last edited by Vectronic; 02-05-2013 at 08:39 PM.
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