Believe Core Center or BIOS voltage?

I have a K8N Neo2 Platinum board (bios 1.1).  Does anyone know if I should trust the 12 volt reading from the BIOS hardware monitor or the MSI core center utility.
I have a brand new power supply (Enermax EG465P-VE FCA).
I am getting the following readings for the 12 volts:
BIOS READING
11.97 -12.03 volts
CORE CENTER READING
11.61-11.91 volts
I have been experiencing some stuttering with my new eVGA graphics card and the tech support thought I the power supply might be the issue since it is sensitive to the 12 Volt rail.  They were not sure which voltage reading is correct. Unfortunately, I do not have a volt meter to probe inside.  Could it be that once windows loads up, it activates more devices causing a voltage drop of some sort?
Any help is appreciated.

The BIOS readings are almost certainly more accurate.
How many amps does your PSU have on 12V? If 24+, then it's unlikely to be that - your voltages look well within spec.
Graphic stuttering can also be caused by several other things, including drivers, AGP fast writes to name a couple.
A slight voltage drop is normal with more devices, but a good PSU should regulate itself to keep within spec.
Edit: Just checked, and your PSU is 20A on 12V, which is "borderline OK", depending on who you ask  
I'd try investigating other possibilities before you blame the PSU though.

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