Originally Posted by guyladouche
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