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Overclocked gtx 580 drawing 200watts from 8pin! Can I bridge my 12v rails? - Page 2

post #11 of 34
I know what the label says.. however, that is incorrect.. both PCIe connectors on that unit have 12v yellow wires with black stripes(in addition to the black wires which are grounds), the only rail that feeds those wires is the 12v4, so you need to circumvent one PCIe connector by using a Molex -> PCIe adapter wink.gif
post #12 of 34
Thread Starter 
Thanks smile.gif I'll give it a try later, but how miss leading of that label!!
post #13 of 34
Quote:
Originally Posted by andrew513210 View Post

Thanks smile.gif I'll give it a try later, but how miss leading of that label!!
Yeah, it's due to buyer/user ignorance and the fact that most people will buy a lot more power than they need.. so they rarely, if ever, get to test the output/rating claims of these units.. as you've seen already, there are a few people in this very thread who think your unit is insufficient for your needs wink.gif
post #14 of 34
With a HX650

i7 930 1.34v @ 4.2

x2 470's 800/1600/1750 @ 1.000v

kill a watt ~

idle 266-300
load 668

So what exactly does that mean? tongue.gif
When it comes to efficiency, power from the wall vs psu
how far over is its rating?
Edited by Bodycount - 12/22/11 at 4:38am
post #15 of 34
Quote:
Originally Posted by Bodycount View Post

With a HX650
i7 930 1.34v @ 4.2
x2 470's 800/1600/1750 @ 1.000v
kill a watt ~
idle 266-300
load 668
So what exactly does that mean? tongue.gif
When it comes to efficiency, power from the wall vs psu
how far over is its rating?

Assuming ~83% efficiency(my best guess considering the wall wattage, the PSU in question and 115v), you're drawing ~555W at full load(668W at the wall), which sums up to about ~80% of that PSU's output.... in other words, excellent smile.gif
post #16 of 34
Quote:
Originally Posted by Unoriginal Sin View Post

Assuming ~83% efficiency(my best guess considering the wall wattage, the PSU in question and 115v), you're drawing ~555W at full load(668W at the wall), which sums up to about ~80% of that PSU's output.... in other words, excellent smile.gif

Awesome thanks,

So my psu is only drawing ~555w @ 668w? So roughly 100w lower than what my meter says?

So i can leave my cards OC'ed ?
post #17 of 34

You can count on it because all advices from the great man come with personal guarantee to replace you for damage parts. So you are in good hand. Oh better wait for confirmation  tongue.gif

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ケンジ
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post #18 of 34
Quote:
Originally Posted by andrew513210 View Post

Basically, I connected another psu I have to power to the 8pin power connector on its own, then used one of those power meter devices to check the wattage draw from the wall. When exploding the sledge it would reach 200W! But didnt shut down the PC, so clearly this is the reason. My psu has 4 12v rails, each at 18A, giving 216w each. I have the 8 pin on its own rail so clearly I'm tripping the OCP.

Did you place a load only the +12v rail? If so, crossloading might be an issue and you might be tripping an under/over-voltage before OCP.
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post #19 of 34
Quote:
Originally Posted by Bodycount View Post

Awesome thanks,
So my psu is only drawing ~555w @ 668w? So roughly 100w lower than what my meter says?
So i can leave my cards OC'ed ?

Indeed smile.gif
post #20 of 34
Thread Starter 
I cant believe how close I am to the limits of my PSU!

After extensive testing I've found:
Changing the connectors around so I use both 6pin to power the 8pin and then trying the molex to 6 pin on each of the 2 seperate 'physical' molex cables made no difference.
If I unplug my 3 dual cathode boxes I can over clock the gpu core to 950mhz.
If I plug in JUST 1 cathode box, I get a restart at 950mhz
If I run the gpu at somewhere around 850 - 900mhz with everything connected it seems to be alrite.

4 seperate and clearly labelled rails my ass! Looks like I should really upgrade. Not impressed with OCZ's 600w as I'm pretty sure I'm not pulling its max (even for a short period)
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