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Faulty power meter?

Last response: in Components
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January 31, 2009 1:06:29 AM

I got a $20 voucher for Christmas and decided to buy a power meter. I've been around measuring various appliances to find quite a few surprises.

Here are my findings

The reason I think it might be faulty is because my computer struggles to use 83 watts! what is the use of a 1200w PSU??

More about : faulty power meter

a b ) Power supply
January 31, 2009 2:09:12 PM

It depends of what components were used to build your system. Why did you get a 1200W PSU? Do you have 3-4 high power video cards in SLI?
February 1, 2009 12:27:28 AM

nah i just have a 430w psu. (see member configuration for specs)

lets just pretend that my 4850 consumes all the power(83w) and all other components use nothing. Then we add another 3 4850s so its 83*4=332w. I know my 4850 isn't the most power hungry card in the world but could the most power hungry card really use 3x the power of my 4850? ...hmm that's not a very good way of making my point but it'll do :) 

either:
-my power meter is faulty
-1200W PSUs are useless
-the 4850, 90nm 5600+ and other components are very energy efficient.
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a b ) Power supply
February 1, 2009 1:23:48 AM

It's difficult to determine if you have a faulty power meter since we know nothing about it nor do we know how you are using it.
February 2, 2009 6:50:51 AM

sorry. I the plug power meter into the wall then i plug a device into the power meter. Just like those timer thingys except it tells me things like volts, amps, watts and has a few other features I haven't really used.

Oh and apparently my computer doesn't use a constant stream of power. it spikes by about 0-10watts every second.
a b ) Power supply
February 2, 2009 2:32:55 PM

My system draws/consumes approx 220W Idle (320W under load) As measured at the outlet.

You could check your meter by pluging 3 100 W lamps into a extention chord then plug into watt meter and then turn lamps on 1 at a time. Regular light bulbs a pretty much resitive.
a b ) Power supply
February 2, 2009 4:37:15 PM

Sharft6, you had a $20 voucher, but that doesn't tell us if you bought a cheap $20 meter or a high-precision one that costs a lot more. Which unit did you buy?
February 3, 2009 3:09:00 AM

oh you wanted exact model?
http://www.dse.co.nz/dse.shop/4987d0c7011abd64273fc0a87...

its one of those except its cost me $20 which is about 10USD lol.

RetiredChief said:
My system draws/consumes approx 220W Idle (320W under load) As measured at the outlet.


Yea i would think my rig only uses a little less than yours

RetiredChief said:
You could check your meter by pluging 3 100 W lamps into a extention chord then plug into watt meter and then turn lamps on 1 at a time. Regular light bulbs a pretty much resitive.


i've measured 3 60w bulbs and 2 20w ones. All of the tests were within 3w of the bulb watt rating. All 5 bulbs going at once were 217w
February 3, 2009 5:01:21 AM

Seems wrong. My computer (4870x2 + i7) draws around 150W idle, and around 500W full load. Yours would definitely be below that, but with a 4850, you should at least be over 100W full load.
a b ) Power supply
February 3, 2009 2:44:24 PM

Your Power meter is working for a resistive load. Your computer is a reactive load and your meter could be inaccurate.

I agree with cji that under load you should be closer to 150 W.

Take a measurement at Idle, then run FurMark and note the increase - it should increase about 60 - 70 watts. The 4850 by itself should be approx 47 W idle and 109 W at load.

Link for fur mark
www.ozone3d.net/benchmarks/fur/
February 5, 2009 3:39:18 AM

yea supposedly my whole computer uses about 61-75 idle and 80-88 with furMark which was pretty impressive. I can't find anything that uses as much power as furMark :D 
February 5, 2009 6:34:35 PM

oh I just did a factory reset/master clear and its working fine. up to 270 with FurMark and 123 idle.
!