OK, i'm taking what i said back. Had a flat battery in my DMM and relied on Asus PC Probe for the voltages readings. I knew i should not trust a soft but the fact that it showed the 12v, 5v and 3.3v rock solid made me wonder why voltage swing would only affect the other voltages, why would PC Probe not affect those three too.
Well, i changed DMM's battery and took readings and there is no voltage swing other than .01v here and there and i suspect that's when the voltage is standing near .xx9 or .xx0
So, to summarize, PC Probe is putting as much as .04v swing where there is almost none