How much vcore for i7-3930k at stock clocks?

Dave3000

Golden Member
Jan 10, 2011
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What would be the proper vcore to set if I want to manually set it for a non-overclocked i7-3930k? The reason I ask is because the auto vcore on my motherboard causes the vcore to go up as CPU frequency and cores used goes up. With turbo enabled and C-states enabled the vcore depends on the CPU frequency and cores used which means that there not really a static vcore during load if the cores and frequency continuously change. For example during Prime 95 with all threads loaded with 6 cores active at 3.5GHz, the reportedvcore by CPU-z is 1.192v and with only 2 cores active and loaded at 3.8GHz it's around 1.238v and with only 1 core active and loaded at 3.8GHz it's around 1.232v. Should I just set the vcore to a value that will get me the same load voltage during Prime 95 when testing all cores which would be a manual 1.235v with LLC off? However, if I do it that way wouldn't I be undervolting my CPU for 1-2 cores loaded at 3.8GHz? I would need to set the vcore to 1.256v in the BIOS to get the 2 core 3.8GHz load vcore matched if I don't use LLC and it would end up giving my CPU little more vcore than I need for 6 cores at 3.5GHz loaded. What would be the best manual vcore to use if I want to have enough vcore to accommodate different stock turbo frequencies and varying cores used for my i7-3930k?

The reason why I want to use a manual vcore is because it's a workaround for squealing noises that my motherboard is making if I want to keep c-states enabled for full turbo functionality.
 

Idontcare

Elite Member
Oct 10, 1999
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Load RealTemp and it should show/report the VID as requested by the CPU to the mobo at any time. Look for the VID when the CPU is under load, that is what you should set the manual voltage to.
 

Dave3000

Golden Member
Jan 10, 2011
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I know about that. It's just that the VID in Coretemp can go as high as 1.256v when only stressing 2 cores at 3.8GHz. However, when stressing all 6 cores at 3.5GHz, the VID in Coretemp shows 1.236v. If I would set the vcore to 1.256v in the BIOS without LLC then it would give me more vcore than I need when stressing all 6 cores at 3.5GHz but if I set it to 1.236, it would give me less vcore than what I need for 2 cores and 1 core at 3.8GHz. If I kept my CPU frequency at a static frequency all the time then I would not have this issue of multiple vcores needed for my CPU and trying to find the best vcore to accomodate all stock turbo frequencies for amount of cores active, that is if I want to use a manual vcore which I do.
 

Dave3000

Golden Member
Jan 10, 2011
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Also if I run Prime 95 only on 2 threads at 3.8GHz turbo the VID in Coretemp shows 1.256v. I'm not going to have all 6 cores being utilized in every application or game, sometimes it will be 2 cores at 3.8GHz in one game or 6 cores at 3.5GHz in another game or even fluctuating frequencies and cores activating/deactivating in certain games.