What would require more vcore?

[Dave3000]

On an i7 3930k chip what would require more vcore if you set your vcore manually, 2 cores running at 3.8GHz or 6 cores running at 3.5GHz? The reason I ask is because I own an i7 3930k and in Coretemp it says that the VID is around 1.24v when 2 cores at 3.8GHz are running while the other cores are in a sleep state, but when all 6 cores are running at 3.5GHz, the VID shows 1.22v. I understand that the VID is the requested vcore for the CPU but not the actual vcore that is being supplied to the CPU but I find it strange that 2 cores or even 1 core at 3.8GHz request more vcore than 6 cores running at 3.5GHz based on what the VID is showing. Doesn't 6 cores at 3.5GHz consume more power than 2 cores at 3.8GHz? Reason I'm asking this question is because setting a manual vcore for my CPU get's rid of the occasional squealing noises coming from the CPU socket area of my motherboard, and at the same time I don't lose any turbo boost function since I can still have the C-states enabled but the drawback is that my idle vcore will not drop during idle. If I disable all CPU power saving features but leave turbo boost still turned on in the BIOS and Coretemp shows 1.22v during idle, is that what I should set the vcore to in the BIOS?

 

[Dave3000]

1.192v is what CPU-Z shows when all 6 cores are running at 3.5GHz, but the VID in Coretemp shows 1.22v and I understand that this is because of vdroop.

 

[VirtualLarry]

there is a relationship between voltage and frequency. The higher the freq., the more voltage it takes. Largely irrespective of the power draw.

 

[Dave3000]

If I set my vcore manually, it will ignore what my vcore should be per a given frequency, so if I'm running into a situation where my CPU ramps up to 3.8GHz with 2 cores loaded and disables the other 4 cores, it might not be enough vcore because I used the vcore that is needed for 6 cores at 3.5GHz which is less vcore. If I set my vcore to the amount that is needed for 3.8GHz with 2 cores active, then I might have a little too much vcore when I'm in a scenario where I'm running all 6 cores at 3.5GHz. If I'm going to set my vcore manually should I just set all my cores to run at the top turbo bin for my CPU (3.8Ghz) and disable all C-states except C1E so my vcore is always the correct one when my CPU is loaded?

 

[Idontcare]

The minimum voltage necessary for stability is dependent on both clockspeed and operating temperature, it is not going to be dependent on core-count or power consumption.

So you do need to set the Vcc appropriately for 3.8GHz regardless how many cores you intend to take there. Then run a nice stress program like LinX or Prime95 to get the temperature up so you can be sure the voltage is stable at both the clockspeed and the operating temperature.