Understanding a bit more

[Aerobahn]

OK i have a new PSU comming on the way.

When my CPU runs load or anything close to 50% my 12v drops from 11.920 to 11.630-11.730 ish. Is that bad? it will go up and down the more or less the CPU is used.

 

[firtol88]

Depends on where you are getting those readings, if they are from a DMM then yes... if they are from software

 

[Ice Czar]

the CPU on modern mobos is powered off the +12V from the power supply (stepped down of course by the onboard VRM voltage reglation modual) older boards employed the +5V and so older PSUs are strong on the +5V and +3.3V rails (which are typically combined rails), so if you have an older supply, and your powering a newer mobo, it may not have enough Amps on the +12V rail for everything, in the last 2 formfactor spec upgrades for power supplies the +12V line has nearly doubled

where a 400watt "typically" used to have 15A
now they have closer to 22 > 34A
(actually they have dual +12V rails in the V1.3 and V2.0 spec)

so...your rails dropping could be because there is too much draw on that rail

 

[Aerobahn]

my PSU says 13/17A on the +12v

and its a 400 watt. O well cant wait for my nice and shiny sparkel PSU comming.

 

[Ice Czar]

that would likely be 13A with a 17A peak draw
not dual rails
thet is typically denoted as
+12V1DC or +12V1....XA
+12V2DC or +12V2....XA