Voltage going UP under load? AMD FX-6300

jjblanche

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Nov 19, 2007
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So I'm OCing my FX-6300 and noticed the vcore will jump in CPU-Z when it's put under load. For example it'll be around 1.33 at idle and then jump to 1.356 when I turn on Prime95.

I think I've found a point where it's stable (4.5 hrs small FFT so far) with good temps and a frequency I like so I'm not terribly worried about it, but does anyone know what this could be from? It's a small but not insignificant bump.

It's an ASUS board with all power saving and such disabled except for line levelling.
 
Solution
Depending on the characteristics for VDroop and VDrop that your particular motherboard is designed with, voltage typically goes down a smidge under loading conditions.

Two explanations come to mind for what you're seeing.

You could be seeing a voltage change based on the P-State for a given frequency for your CPU. As your CPU increases it's clock speed, it increases it's VCore to compensate. This is normal.

If you have LLC (Load Line Calibration) enabled in BIOS, your voltage should be given a boost under load to counteract the drooping you normally see in the voltage. Whether this compensation is good and by how much tends to be subjective.
Depending on the characteristics for VDroop and VDrop that your particular motherboard is designed with, voltage typically goes down a smidge under loading conditions.

Two explanations come to mind for what you're seeing.

You could be seeing a voltage change based on the P-State for a given frequency for your CPU. As your CPU increases it's clock speed, it increases it's VCore to compensate. This is normal.

If you have LLC (Load Line Calibration) enabled in BIOS, your voltage should be given a boost under load to counteract the drooping you normally see in the voltage. Whether this compensation is good and by how much tends to be subjective.
 
Solution