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post #2 of (permalink) Old 03-22-2019, 04:22 PM
Memory Overclocker
Join Date: Nov 2018
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VID is not a voltage. It's a value the CPU sends to the motherboard to "request" a voltage and that is used by the motherboard in auto, adaptive or offset voltage modes to determine what voltage the CPU wants right now. The CPU varies the VID value according to load. It's not used at all if you have a fixed, manual voltage set.

First choice for newer motherboards is to look at VR Vout (if your motherboard has that in HWiNFO64).

Second choice, look at VCore.

These last two are the actual CPU voltage being supplied. VR Vout is measured closer to the CPU package and will be more accurate if your board shows it (it's a relatively new measurement sensor).

You should think of a voltage you set in the BIOS as a "rough" knob, not an accurate knob. Turn it up a bit, then look at VR Vout/Vcore to see what voltage is actually being supplied to the CPU. Note that it will vary with load because of vdroop (the tendency for the voltage to droop a bit under higher current loads). vdroop is not entirely bad and some vdroop is required and good (it helps with voltage stability and trying to prevent any vdroop can cause voltage spikes when load suddenly changes), it's just something to understand. It can be partially controlled with the LLC setting in the BIOS. Do not pick the highest LLC setting (can cause voltage spikes).

[email protected] (-1 AVX offset) on ASRock Z390 Taichi with Noctua NH-D15 air cooler
CPU offset voltage of -25mv, runs VRVout 1.240-1.313V on full AVX load, 1.225-1.275V on non-AVX load
2x8GB [email protected] at 1.45V, G.Skill F4-3733C17Q-32GTZKK (XMP rated [email protected])
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