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Wholy PowerSupply Canoli!

post #1 of 11
Thread Starter 
Wow, as most of you have probably heard about this Bitcoin thing, it takes a lot of GPU power. Well, I was pleasantly running at 900MHz Core, 900MHz memory at 330 MH/s on each card. I then thought, hey, what happens when I push these cards to 1GHz? So I did. Settings were 1.275VCore with 1000MHz/900MHz on the VRam. I ran like that for about 5 minutes, before remembering that I only have a 620Watt PSU, so I quickly checked my Kill-A-Watt EZ meter and apparently my PC can draw 702 Watts from the wall on only full load GPUs, the CPU was at like 5%. I then backed down to 900MHz core which only draws 522 watts from the wall.

But basically, I am surprised my PSU even handled 702 Watts from wall for 5 minutes without overheating or just emergency turning off.

I have also heard from Linus that watts from wall is not actually how many watts you are using, was I using more watts or less?
    
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post #2 of 11
I wouldn't be surprised if Antec underrated that PSU, they make quality supplies. I ran one for a good while and it was a trooper.
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post #3 of 11
Depends on the efficiency of your PSU.

If I'm not mistaken you multiply the wattage read by the Kill-A-Watt by the efficiency of your PSU. Say you're pulling 702w * 85% efficiency = ~597w.

Unless I'm doing the formula all wrong.

What you're reading from the meter is wattage including parasitic loss through your power supply, so the higher the efficiency the less wasted energy there is and the closer you are to being accurate with a Kill-A-Watt.
Edited by blackbalt89 - 4/30/11 at 11:20am
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post #4 of 11
I might be wrong, but psu's aren't rated at what they pull from the wall, as they normally only use 80% of what they pull, hence the 80 Gold, Silver,etc.
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post #5 of 11
Power supplies can handle a higher output than they're rated for, but for obvious reasons it isnt recommended. It probably didnt exceed the maximum for the unit, but It wouldnt be good to run 24/7 when you're pulling that much over your PSU's rating. Time for an upgrade eh?
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post #6 of 11
Thread Starter 
Quote:
Originally Posted by 0rion View Post
Power supplies can handle a higher output than they're rated for, but for obvious reasons it isnt recommended. It probably didnt exceed the maximum for the unit, but It wouldnt be good to run 24/7 when you're pulling that much over your PSU's rating. Time for an upgrade eh?
Yea definitely, I'm looking at the 750 HX or the 750 TX, is there any real difference? Besides the HX being modular.
    
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post #7 of 11
Quote:
Originally Posted by snelan View Post
Yea definitely, I'm looking at the 750 HX or the 750 TX, is there any real difference? Besides the HX being modular.
One is 80 plus silver and I think it has better components.
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post #8 of 11
Quote:
Originally Posted by townending View Post
I might be wrong, but psu's aren't rated at what they pull from the wall, as they normally only use 80% of what they pull, hence the 80 Gold, Silver,etc.
They are rated at DC wattage, not AC wattage from the wall.
post #9 of 11
I'm pretty sure PSUs are rated by how much DC they output. So if you were drawing 700W from the wall, your system was probably only using about 700W*0.8%eff = 560W

As other people have said though quality PSUs are rated by their continuous power instead of maximum thus they can usually output slightly more than their rated power.
     
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by AgentHydra View Post
I'm pretty sure PSUs are rated by how much DC they output. So if you were drawing 700W from the wall, your system was probably only using about 700W*0.8%eff = 560W

As other people have said though quality PSUs are rated by their continuous power instead of maximum thus they can usually output slightly more than their rated power.
Hmm, so I am still OK at that range then? Not that it is good for the PSU, but the PSU won't die that that wattage?
    
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