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Psu power consumption tst

Last response: in Components
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September 26, 2010 7:14:25 PM

Hello,

I have this pc:
- Asus m4a785 tdv evo
- Athlon x4 635
- HD5770 vapor-x
- 1 x Hard drive seagate 1500 GB
- 1 x 2 GB ddr3 markvision 1333Mhz
- 3 x 80mm 12V fan
- Thermaltake tr2 600W

I had tested the power consumption of my pc, and I tested my pc with gta4, cod5.

I tested the current in the 120V ac line, whit a small tester.




I got confusing results, When my pc is iddle, the tester shows ~ 0.8 A
When Im playing cod5 whit all max, the tester shows ~ 1.1 A
When Im doing a benchmark whit gta4, the tester shows ~ 1.2 A

power consumption = V * I = 120 V rms * 1.2 A rms = 144 W max.

why? I mean, what am I doing wrong? is it true the psu is only getting 144 W? I dont think so, but I hope you can tell me .

thanks for reading.


edit:

-ammeter : multimeter UNI-T UT33A

- I messured the current like this:

in this draw, the lamp is the pc, and the battery is the 120V line. and the tester was messuring AC current.

a b ) Power supply
September 26, 2010 8:55:03 PM

How did you measure the current? Did you use a clamp ammeter?
What ammete did you use.
Please provide details of your meter connection (how the current was measured). Also include the settings on whatever meter you use during measurement.
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a b ) Power supply
September 26, 2010 9:02:25 PM

did measure between lines or between the socket and plug
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September 27, 2010 3:40:54 PM

obsidian86 said:
did measure between lines or between the socket and plug


between the ac line.
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a b ) Power supply
September 27, 2010 4:56:23 PM

your pc will only draw what it needs from the psu if your parts need 144 watts your power supply will provide 144 watts even if its rated 400 watts or 4000 watts
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September 28, 2010 3:23:09 AM

obsidian86 said:
your pc will only draw what it needs from the psu if your parts need 144 watts your power supply will provide 144 watts even if its rated 400 watts or 4000 watts


yea I know that, thats not my problem, my problem is that my pc should be getting more power, I mean, the graphic card + processor should get 75 + 90 W = 165 W ONLY those parts, so... what am I doing wrong?
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a b ) Power supply
September 28, 2010 5:48:45 PM

run prime95 and furmark together see if things change
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September 28, 2010 8:44:05 PM

obsidian86 said:
run prime95 and furmark together see if things change



I just did it, and the ammeter showed 2.06 A, thats 2.06 A x 115 V = 236 W, more than what I got last time.


but according to the specifications, I should get ~350 W in load.... well, maybe the asus m4a785 tdv evo is not using ~105W (an internet test said that) and the raedon is not using ~108W neighter.
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