-12v rail @ -15v ! help needed

Hi
What does it mean if my -12 rail goes up (or down) to -15v ?

PSU:antec tp 550W
cpu: amd 1500+ @ 1.9ghz @ 2v
mobo: nf7-s v2.0
cooling: custom made phase change

thanks !

Unless you have any sort of stability issues then I wouldn't worry. The -ve rails aren't really used anyway.

after i read pcguide.com on power section/page, the negative rail ar not used anymore in modern system like ATX, or even AT. so don't be worry about it, even some psu's form factor like the one for server not supply negative rails anymore. negative rails is for compatibility, but for what? the device that would use it has already extinc like dinosaurus.. no part of mobo would suck juice from negative rails... so all that i'd really care is 3.3V, 5V, 12V, 5V serial bus, and... that's all..!

and iirc the negative rails is actually not negative...

cmiiw...

*Weird* http://www.ocforums.com/showthread.php?t=346578

As in this thread I started yesterday check it with a multimeter.