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11.8V under load with new card - Page 2

post #11 of 17
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Quote:
Originally Posted by terraprime;12888144 
well if you can manage to get a prong into the plug for the cpu without damaging it, that is definitely 1 rail, the other is gonna be attached to the 6 or 8 pin gpu power cables more likely.

Yea maybe if I solder a lead the risk of shorting my MB or video card would be pretty low, but I don't know if this is warranted.

Maybe recommend a good CPU+video card stress test I could run together and if I crash then dig further?
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post #12 of 17
if everything is at stock and it crashes running say prime95 blend test with idk it running afterburner kumbustor gpu testing app then yeah. But i highly doubt it will happen with that little of a voltage drop.

Oh and you can prob google what cables are connected to each 12v rail. hell should be in the psu user manual i would assume really.
Edited by terraprime - 3/27/11 at 6:58am
 
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post #13 of 17
It really doesn't matter, software readings are frequently very inaccurate. My 12v line reads as +0.4v. Always has regardless of what program. It's all to do with how the motherboard was designed to talk between its sensors and programs. You'll almost never get an accurate read through software.

But there's really no point in even measuring it if your system isn't behaving oddly. Electronics that require a 12v reference voltage will rarely work if there is something wrong with the supply. Even if it's a small amount.

Also, there's no point worrying about using different lead lines from the PSU to supply your GPU vs. CPU etc. because the 6-pin line is ALWAYS different from the mobo 24-pin connector. But even if it weren't, if your worry is the voltage on the line, it doesn't matter because it all comes from the same 12v supply source (your PSU is not generating two different 12V sources just because it has multiple 12v lines). The reason for multiple 12v rails in a PSU is just so that all the current from the 12v supply isn't traveling on the same wire, because of current tolerances of the wire. But the 12v supply is the same for all of the "rails" coming from your PSU--so if you have one "dirty" 12v supply, they'll all be dirty.

You're fine, really, unless you're experiencing system instabilities.
    
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post #14 of 17
Quote:
Originally Posted by guyladouche View Post
It really doesn't matter, software readings are frequently very inaccurate. My 12v line reads as +0.4v. Always has regardless of what program. It's all to do with how the motherboard was designed to talk between its sensors and programs. You'll almost never get an accurate read through software.

But there's really no point in even measuring it if your system isn't behaving oddly. Electronics that require a 12v reference voltage will rarely work if there is something wrong with the supply. Even if it's a small amount.

Also, there's no point worrying about using different lead lines from the PSU to supply your GPU vs. CPU etc. because the 6-pin line is ALWAYS different from the mobo 24-pin connector. But even if it weren't, if your worry is the voltage on the line, it doesn't matter because it all comes from the same 12v supply source (your PSU is not generating two different 12V sources just because it has multiple 12v lines). The reason for multiple 12v rails in a PSU is just so that all the current from the 12v supply isn't traveling on the same wire, because of current tolerances of the wire. But the 12v supply is the same for all of the "rails" coming from your PSU--so if you have one "dirty" 12v supply, they'll all be dirty.

You're fine, really, unless you're experiencing system instabilities.
Actually, you couldn't be further from the truth. 12v rail specifications call for 11.4-12.6v DC. That is TECHNICALLY within ATX spec.

I've had a PSU that ran at 11.7v idle, 11.45v load (still within ATX spec mind you), and it would crash immediately under load. As soon as I put a lower power GPU in, it was fine. I tested these voltages with my multimeter, using the 24pin and a molex line to ensure proper readings.

I won't trust a PSU that drops below 11.7v personally (using a meter).

I do agree though, software and sensors are pointless, as they are NEVER correct. My 12v rail reads at 10.8v on my rig through BIOS and software. My multimeter shows 12.3v idle and 12.25v load. So I'm good.
Edited by pioneerisloud - 3/27/11 at 7:27am
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post #15 of 17
Quote:
Originally Posted by pioneerisloud View Post
I've had a PSU that ran at 11.7v idle, 11.45v load (still within ATX spec mind you), and it would crash immediately under load. As soon as I put a lower power GPU in, it was fine. I tested these voltages with my multimeter, using the 24pin and a molex line to ensure proper readings.
To be fair, that could have been other problems too such as voltage spikes/dips or poor filtering.

Having said that, I would not want to give my components 11.4v or 12.6v
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post #16 of 17
Quote:
Originally Posted by fluxlite View Post
To be fair, that could have been other problems too such as voltage spikes/dips or poor filtering.

Having said that, I would not want to give my components 11.4v or 12.6v
I agree. Was just saying, that the PSU in question was still TECHNICALLY within ATX specifications, my meter updates every like 1/2 second, and it didn't show me any dips or spikes.

And I also stated, I personally won't trust a PSU that drops below 11.7v, or goes higher than 12.3v.
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post #17 of 17
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I ran Intel Burn and Kombuster together and had no crashes, I am satisfied, I appreciate the tips.
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