A very informative article:
http://www.neoseeker.com/Articles/Hardware/Reports/motherboardvoltages/
Basically shows that if ur system is stable,there is not much to worry about for the mobo’s sensor showing +/- 3% deviation from the ideal voltage. 
With my ASUS P4C800ED board and Antec True 480 PSU I get the following readings…
By MotherBoard Monitor as well as ASUS Probe…
11.91
4.99
3.25
With a nice German Digital MultiMeter
12.04
5.06
3.28
I trust the DMM readings
guys how are u measuring the voltages using the DMM? i mean on what connectors are u measuing these voltages?
On my A8N-E with Antec TP480, I measured on the Molex connector for +12V n +5V.
Asus Probe:
+12V - 11.648~11.712V
+5V - 4.892~4.919V
some local DMM:
+12V - 10.65V (steady)
+5V - 4.5V (steady)
Masky,man ur 12v line is really low.The 450W colorsit I just got shows these using pc probe:
12v-12.6v/12.8v(idle/load)
5v-4.95/4.87
3.3v-3.3/3.28
Heavent measured with dmm yet.
I just got this smps to replace an older 400w one from the same company(claimed 400w coz the rails added up to a measly 237w).
This one is much better :
5v:30A,12:19A,3.3V:18A.Thats 437W total not bad for a Rs.1100 psu with dual fan with speed control as well.
For AXP users a lil lower 5v and a lil higher 12v is to be expected for certain reasons.For A64/P4 users however there is no such issue.
well.. i am sure the voltage cant be as low as the ones given by my DMM. at those voltages the system wont be stable at all.. but i dont have stability problems.. system runs just fine, even OCed to 2.75gigz i cud run 3D Mark 03 n all
I think there is some mistake in ur measurement or may be ur cheapo local multimeter is bad coz antec usually gives 1% deviation at most.In fact PSU may be rated according this criteria:
Percent deviation from ideal voltage(esp. if it s -ve deviation):
1%-excellent
3%-good
5%-average(most good local smps will meet this criteria)
Recent Intel spec sheets call for 3% regulation.
12v and 5v off the Molex and 3.3 from Aux Connector…
here is a chart of voltages and wire colours…
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tnx for the pic bro.. but i am kinda concerned about the readings on my DMM now..
You should not have a problem getting the DMM to read correctly - there normally is a POT (right word ?) inside which you turn to change the reading. If you compare your DMM against another one which has what you think is a more accurate readings then you should be fine. I have a friend who has an expensive DMM - a Fluke - and I matched mine to that meter.
well.. mine looks conked (perhaps needs an internal battery change).. mine’s a cheapo model n it reads 206V on the AC socket.. lemme see if i cud borrow another from a friend n check.. 
For once I am counting on Asus Probe than on my stupid DMM
for me,
Athlon 2500+ @ 3200+, 1.7V Vcore. Powersafe 500W
DMM :
Idle :
3.40V
5.10V
12.48V
Load ;
3.36V
5.05V
12.55V
ASUS Probe :
on my old board, A7N8X Dlx idle showed up as 3.26V, 4.95V, 12.41V. Load , same.
new board A7N8X E Dlx, Idle : 3.34, 5.026, 12.48V load : 3.36V, 4.999V, 12.552V
heh..talk about accuracy on the new board!!!
i was really worried abt the voltages at first when i got it, a quick reading thru the DMM proved me wrong
I’m a little worried too.
Asus probes shows me 11.71 on the 12v line.I use a Smartpower 400w.
I don’t have a DMM so I don’t really know what the real story is.
I think that a 6800GT is not suitable for this PS, Won’t you agree?
Anyhow its a temporary arrangment, hopefully my 6600GT won’t be starved for any power.
I have a cheap VIP 300 watts shows 11.712 on the 12V and it fluctuates a lot. Just had an issue once but that was with Cool n quiet enabled. Also I have a 9800 pro which is one power hungry card.
I wouldnt worry too much on the readings as my friend is using an AXP + 2 HDDs + 1 optical drive + 3 Fans + 2 Lan + 9800 pro on a 200 Watts generic Mercury powersupply @ 24hrs on and he hasnt had a single issue since more then a year now.
Yea same here Aces…no problemo on a Generic PSU till now with loads of things attached. Touches wood
I had posted it smewhr…lemme get it
EDIT:
Here’s the linky
Are there any other methods to tune your DMM? I dont know anyone else around with a DMM
Even my rig was running fine with Colorsit smps rated at just 5v:12a,12:10a,3.3v:13a.But When I saw the 450w one with sata,24 pin connector and dual fan w/ speed control for just 1100,I had to buy it.Atleast I don’t have to worry when I add a new 6600/6800 later on.
BTW this company seems to be pretty decent:
You imported your PSU from China ? If you did than the shipping must have been more than the cost of the PSU
No man,got it staright from a warehouse in NP.LOL.
i just got an el cheapo dmm today as well 
tp 480 i got
+5v…4.85v 
+12v…12.01v
neopower gave me
+5v…5.01v-5.03v
+12v…12.03v
was running prime when i was testing voltages if it makes any difference.. now anyone wanna tell me how to go about measuring 3.3v ?
Use the main atx connector itself,there is enough space there for a dmm probe.Btw prime95 is nothing compared to cpuburn ,it literally tries to roast ur system alive. 