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PSU Wattage Calculators Accurate?

post #1 of 16
Thread Starter 
While looking for how many watts my system draws, i came across 3 psu wattage "calculators" that people have coded.

Has anyone used psu wattage calculators that are on the net?, eXtreme outervision (the most reputable looking) predicts that my system will pull 547W at full load (including overclocks) http://www.extreme.outervision.com/p...ulatorlite.jsp is this accurate?

because according to this, in 3 years a 620w psu won't be able to power my system due to capacitor aging, let alone any upgrades. this makes me want to go higher than 620/700w but is it really necessary???

**rig from quote**
CPU: Athlon x2 4200+ Windsor 90nm
Ram: 2 x 1gb DDR2 PC2-4300(266mhz) infineon ram (will upgrade eventually)
MoBo: ASUS M2R32-MVP (deluxe if they ever release it)
GPU: Crossfire Reference x1950 pro's
HDD: Raid 0 500gb (2x250gb)

Case: Antec P182
Cpu Cooling: Zalman CNPS9500 AM2

(i realize that some of this question is pasted from another thread, but i felt it needed it's own thread)
    
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post #2 of 16
They aren't really accurate at all to be honest. Just a little toy for giving you a rough guess. I'd say they're about +/- 150w from the actual ammount. They told me my computer would draw 429w but I measured it and it's actually 299w full load and around 180w idle.
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post #3 of 16
Some estimates at stock speeds using TDP off the top of my head:

CPU: 89w off +12v
RAM: 30w off +3.3v
Mobo: 50w off multiple lines
GPU: 140w off +12v
Two HD: 12w off +12v and 12w off 5v

Each fan is 4-8w off +12V
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post #4 of 16
i haven't come across an accurate one yet. they all say i need an 800 watt PSU or something silly like that. i'll give rep if anyone can find a truly accurate one. it'd come in handy.
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post #5 of 16
Thread Starter 
Even if it's intentionally inflated to help the PSU market, it worked on me, lol...
so i'm going to get either
A: Corsair 620HX
B: OCZ GameXstream 700w
C: Thermaltake Toughpower 750w

Incase i want to get any Wicked GFX cards in the future.

Wait....none of these power supplies have 8pin pci-e connectors......?
bummer
    
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post #6 of 16
Quote:
Originally Posted by Fishie36 View Post
They aren't really accurate at all to be honest. Just a little toy for giving you a rough guess. I'd say they're about +/- 150w from the actual ammount. They told me my computer would draw 429w but I measured it and it's actually 299w full load and around 180w idle.
How does one measure the full load of a computer loading the processor, GPU, HDD, Optical drives, Floppy disc, and ram all at once? *****. I'd really like to find out...
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post #7 of 16
Quote:
Originally Posted by MrBungle View Post
i haven't come across an accurate one yet. they all say i need an 800 watt PSU or something silly like that. i'll give rep if anyone can find a truly accurate one. it'd come in handy.
You take the maximum power specification of each component... and add them up. Don't forget there are three postive rails that different components use.

You also really don't want to run your PSU at 90% load. A 20-30% leeway is highly recommended. Also, PSU performance is affected by temperatures.
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post #8 of 16
Quote:
Originally Posted by Sideburns View Post
How does one measure the full load of a computer loading the processor, GPU, HDD, Optical drives, Floppy disc, and ram all at once? *****. I'd really like to find out...
I got an actual piece of hardware called watts up

It sits between the PSU and the wall and all the power for the computer has to run through it. The only downfall is that it also figures in the losses in the PSU, so it isn't too helpful for knowing what size PSU to buy (a less effecient PSU will make you think your computer draws more power than it needs to).

If you figure that my PSU is 80% effecient at all times (the rating), then that would mean all the components in my computer are drawing 240w full load and 144w idle.
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post #9 of 16
Came up with 222w for me. I don't think I'd attempt to run any computer with that small a psu.
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post #10 of 16
Most sub 400 watt PSU's aren't any good these days...
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