I have a question that I'm having a very difficult time in finding people online who are having the same issue. I have a 7700K and an Asus Maximus IX Hero and I'm trying to overclock to 4.8 GHz.
I've set the following in the BIOS:
Core Ratio: 48
IA AC/DC Load Line = 0.01
LCC = 5
Additional Turbo Mode CPU Voltage: 1.25V
XMP profiles for my RAM
Through some trial and error, I think I found my stable voltage at 1.25V, but I'll have to test further. My question is this though:
For some reason, whenever I'm running anything that has AVX2 instructions like x264 and RealBench, I am getting a reading of Vcore = 1.28V in HWInfo64. When gaming, I am getting what is expected, which is 1.248V. What is causing this additional 0.03V voltage? I have been Googling all day and it looks like this used to happen in Haswell, but should not happen for Kaby Lake and Skylake anymore.
Am I missing a BIOS setting and is this normal? Any input and ideas would be super helpful.
I also found this in a Haswell guide. Does this still happen for Kaby Lake? (note that my additional voltage is 0.03V and not 0.1V as stated below)
"Adaptive Mode: Adaptive voltage affects voltage for Turbo multiplier ratios only. Unlike Offset, using Adaptive does not affect idle/light load Vcore. Therefore, Adaptive mode is the preferred method for overclocking Haswell processors if one wishes to retain dynamic voltage changes according to processor load without running into issues with idle Vcore becoming too low..
There is one issue with Offset and Adaptive Mode that needs to be taken into account. The processor contains a power control unit which requests voltage based upon software load. When the PCU detects AVX instructions, it will ramp Vcore automatically beyond normal load voltage. There is no way to lock Vcore to prevent this if using Offset or Adapative Mode. This is pre-programmed by Intel into the PCU. As an example, a CPU is perfectly stable at 1.25V using a manual voltage (static), if Adaptive or Offset Mode is used instead, it is impossible to lock the core voltage when running software that contains AVX instruction sets – stress tests such as AIDA and Prime contain AVX instruction sets. When the AVX instructions are detected by the PCU, the core voltage will be ramped an additional ~0.1V over your target voltage – so 1.25V will become ~1.35V under AVX load. If you intend to run heavy load AVX software, we recommend using Manual Vcore, NOT Adaptive or Offset Mode.
Most of us do not run AVX related software, so this is a non-issue. Either way, dialing in an overclock using Manual Vcore to determine how much voltage the processor needs under full load is best - Adaptive or Offset mode can be used to match the stable voltage later on. Simply type the target load voltage into the entry box "Additional Turbo Mode CPU core voltage" to set adaptive voltage"