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Is this right?

W

WiL11o6

Limp Gawd
Joined
Feb 20, 2007
Messages
478
I bought one of these P3 Kill A Watt meters here: http://www.amazon.com/gp/product/B0...pf_rd_t=3201&pf_rd_p=1280661782&pf_rd_i=typ01

Testing a session of BF3 on load and a 3dmark11 run, it never exceeds 550 watts. I have two 7970 OC'd to 1025/1475 on stock 1.05 voltage and 2600k OC'd to 4.5ghz. I was expecting closer to 700 watts on full load not 550 watts. Is this reading correct? I have v-sync disabled to allow my GPUs to run at 99% capabilities.
 
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Why exactly were you expecting more!?.. those are the correct values for such loads :)
 
Well, I knew people exaggerated on getting some super powerful 850+ watt power supplies for CF or SLI, but I never expected load usage to be this low. Thought it would be closer to 700w especially for two high end GPUs, even though they are 28mm tech.
 
WiL11o6 said:
Well, I knew people exaggerated on getting some super powerful 850+ watt power supplies for CF or SLI, but I never expected load usage to be this low. Thought it would be closer to 700w especially for two high end GPUs, even though they are 28mm tech.
Click to expand...

Run Prime95 SmallFFT while simultaneously running Furmark or Kombustor with the cards, you'll pass 700W... but again, that's not a realistic load.. most people don't get the difference.
 
lol, yeah that's what I meant.

I am used to typing mm since I do have a 30mm, 50mm, 24-70mm.
 
Consider the figure you're getting a ballpark figure due to KAW's inaccuracies. So that setup could be drawing as much as 600W to 650W or even lower at 500W.
 
I thought it is accurate. If that's a ball park estimate, I coulda done so myself
 
As long as you measure straight resistive loads (heaters/incandescent light bulbs), the KAW is really close. To be fair, with most loads its close. Inaccuracies crop up when you use it with any kind of high frequency switching power supply as it pulls current in "chunks" too fast for the KAW to measure.

For what it is a KAW works. I have a couple of them I use to test generators/set frequencies before hurricane season.
 
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