Odd PC Voltages

I would not worry about that. However you could measure them with a reliable voltmeter to be sure. -12V are used for the serial port, if you have something connected there like a serial mouse that could explain the voltage drop. If it works, leave it as is. I think there is nothing nowadays using the -5V rail so that could explain it is slightly higher.

either you using your DMM incorrectly with the common probe placement or you have an issue with the - output side the supply..

Looking at the -12 line and seeing it's only -9.32 volts, this maybe due to excessive load, the -5 line being over voltage could be a by product of the PSU trying to correct the -12 and the -5 is regulated on it's own. I would worried about the -5 being high.., I think you should correct that.

Hardly high for Hawaii ! Silicon functions up to vastly higher temps than that. Why do you think it's high ?

Yes, the +5 is +5.08.

You could buy a cheap DMM and measure the +12 on an unused drive connector if it worries you !

Negative voltages are hardly ever used these days so it's probably 'out of regulation' due to no load.

Graham

They usually have their own charge pumps these days. Remember the spec goes back to 1982 or so.

Graham

On Sun, 28 Dec 2008 20:56:27 -1000, "John Keiser" put finger to keyboard and composed:

The first thing you should do is to compare your readings with what BIOS tells you.

The motherboard's hardware monitor chip probably has a multi-input A/D converter with an internal 4.096V precision reference. This means that any voltage outside the range of 0V to 4.096V has to be scaled down via an external potential divider. The Vcore and 3.3V inputs could be measured directly, but the others cannot. Negative voltages would require a DC bias. The potential divider ratios would be known to the BIOS but not to Everest. Hence the BIOS readings can probably be trusted, but not those of any software tool. Remember also that the hardware monitor is seeing these voltages as they appear on the motherboard, not at the PSU. Hence you need to be aware of voltage drops in the cables and in the motherboard traces.

I prefer to use Motherboard Monitor, but unfortunately support for it ceased many years ago. MBM 5 allows you to specify your own voltage divider ratios and many other parameters.

- Franc Zabkar