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Your thoughts on Kill-a-watt meter

post #1 of 7
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Sup guys,
I went out to menards today and picked up a kill-a-watt sensor (http://www.newegg.com/Product/Product.aspx?Item=N82E16882715001) to see my actual wattage on my gaming rig. You could say I did it because I was feeling buyers remorse for picking up a corsair hx 1050w off ebay to replace the hx 750w in my rig right now. I'm upgrading to see if my sli gtx 680 ftw+ 4gb cards don't overclock well because they are maxing out the power from the psu.
I didn't really have time to do a bunch of tests on it, but on single passes of iracing and dirt3, the max reading on the kill-a-watt was 425 watts. That's with a 2500K overclocked to 4.5GHz on 1.25v and stock clocks on the sli cards. The rest of my rig is in my sig, plus 4 gentle typhoon AP-00 fans (2150rpm) on the H100, 1 corsair 200mm fan, and 4 xigmatek xaf-f1255 fans (soon to be 6 of them). all of these on the hx 750w..
So now I'm asking myself do I really need a 1kW psu? Are those kill-a-watt meters accurate?
(BTW I quickly ran Intelburntest with standard settings and it maxed out at about 280w. The thing that worried me though is that the runs took longer 11-12secs instead of 8-9secs, and the gflops were lower about 78 instead of the 100s. CoreTemp stated that my 2500K was still at 4.5GHz. Not sure why)
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post #2 of 7
Uhh yea you don't need a 1kw psu a 750 would've done just fine. Those killawatt things are pretty accurate. and a 2500k + 680 at around 425 sounds about right.

Tech these days are really efficient.
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post #3 of 7
I have been using my Kill a Watt for the last 6 years
and is accurate.
Hope this helps smile.gif
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post #4 of 7
Quote:
Originally Posted by KuuFA View Post

Uhh yea you don't need a 1kw psu a 750 would've done just fine. Those killawatt things are pretty accurate. and a 2500k + 680 at around 425 sounds about right.

Tech these days are really efficient.

Be reminded this is at AC wattage, not DC thumb.gif (though they are the same thing, it is that the DC current in the machine runs at a higher amperage, amps x v = watt)

Though for that, 425 doesn't sound off at all.
Edited by Lord Xeb - 3/28/13 at 8:16pm
 
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post #5 of 7
450 sounds about right.

http://www.guru3d.com/articles_pages/geforce_gtx_680_sli_review,4.html

Keep in mind that the kill-a-watt is reading your draw from the wall.

Draw from the wall = Component power consumption + PSU inefficiency.

1000W from the wall with a 80% efficient PSU means the components are only drawing roughly 800W for example.



Intel burn test times will be effected by anything else running on your computer, even browsing the internet can increase the time quite a bit.
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post #6 of 7
Mine seemed accurate until it lost its factory calibration one day- everything was obviously and completely off when that happened. I'd say that's probably a good number.
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post #7 of 7
Quote:
Originally Posted by Lord Xeb View Post

Be reminded this is at AC wattage, not DC thumb.gif (though they are the same thing, it is that the DC current in the machine runs at a higher amperage, amps x v = watt)

Though for that, 425 doesn't sound off at all.

+1 you are converting high volts to low and ac to dc.

you cant do a 1:1 comparison. i know there is math to it but idk it really, but to give you an idea a 50va ( 50w ) 120v to 24v transformer probably uses .5a if that..... that gives you @ 2a of 24v. this is ac to ac and not as good of components as whats in psu's ( not nearly as good of an efficiency)

was it over kill maybe. but it NEVER hurts to have more power available. it just means you can keep it for generations of pc equipment to come. maybe look into water cooling if it bothers you so much ... wc setups use alotta watts...

found it here

so.... yea really you can not easily determine it due to how they change voltages in psus ...... [could be wrong]

however either way better to have too much power available to you then too little... so be happy !!!nerdsmiley.png:

(just checked it with that calculation. 50va would use .4166amps...... not bad of a guess huh ? )

according to the specs your power supply can use ( 120v )13a [1560 watts] you are using approx 23% of your available power.
just my random thoughts
Edited by Mega Man - 3/28/13 at 10:39pm
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