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Didn't realize how little my computer consumed!

post #1 of 31
Thread Starter 
So out of curiosity, I decided to check just how much power my rig was consuming, and how hard my psu needed to work. It's 750 watts, but is a piece of junk, so lets assume 600 watts max.

So I brought home the amp clamp and frayed an old power cable.

Hooked it up, and checked my idle amperage.
This is what showed.



Now 1.3A x 120V x 0.80 (Worst case efficiency) = 120 Watts.
Thats the equivalent of two average incandescent bulbs!

So I decided to put this thing in max power state.

1055T 3.8 Ghz, and 5770 at 960/1400 Mhz (Linx shows 71 G/flop)







3.8 Amps! Thats it!
So 3.8 from the wall means that my system only actually uses 365 Watts MAXIMUM possible load! :O

So that means a good 400 Watt PSU could easily keep my system running!
Never realized just how little my setup used!
(This includes 4 7200 rpm hdd's, and various other things hooked up.

Next time, I'm just getting a 500 or 600 watt unit by antec, or seasonic.
    
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post #2 of 31
PSUs are like the most often underestimated component.
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post #3 of 31
Quote:
Originally Posted by TrueOptic View Post
PSUs are like the most often underestimated component.
this.

I ran an overclocked 4870 and i5 660 @ 4.6 off of a cheap antec 380W

ran great, even under full system load
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post #4 of 31
Yeah you have a pretty low power consuming video card, thats usually were a lot of the watts come from. 5770's are really popular because they pack quite a punch in crossfire and consume very little power.
post #5 of 31

Also, when you're running a PSU that is major overkill (where it's not even being stressed), its efficiency drops a lot, just like if it was being really stressed. That is, if you care about efficiency.

~8:34

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post #6 of 31
My step-dad is running a system with a Phenom 9850 and a Radeon 5770 off a Delta Electronics 350W power supply (on my advice) and I doubt he's even really pushing it.
post #7 of 31
Thread Starter 
Yeah, definitely gunna sell this guy for like $30 and buy myself a nicer one.

Btw how accurate are these amp meters?
Im borrowing this from my dad, this model was some six or seven hundred dollars...
    
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post #8 of 31
This is why when someone wants to get a single 5770, I tell them that AMD recommends a 450W PSU, and then I follow that up by saying that even a quality 350-400W power supply would have plenty of power.

Source: http://www.amd.com/us/products/deskt...verview.aspx#3
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post #9 of 31
Woa.. Good news for me!
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post #10 of 31
Quote:
Originally Posted by fazio93 View Post
Also, when you're running a PSU that is major overkill (where it's not even being stressed), its efficiency drops a lot, just like if it was being really stressed. That is, if you care about efficiency.

~8:34
www.youtube.com/watch?v=iKk2_1u26tg
Not true for all PSUs. I know that my enermax maintains a 85% or more efficiency for anything from almost no load to almost maximum load. I've seen the tests. I know it's complete overkill for my rig but I bought it for the silence. Since I only use at most about 45% of its power the fan never even speeds up above idle.
    
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