Voltage is low when overclocking

Amerad33

Honorable
Feb 11, 2014
7
0
10,510
Name:
CPU: 4770K
Motherboard: MSI Z87-G45 Gaming
CPU Voltage: 1.1
CPU Bus Speed/Multiplier: Trying to get to 4.2
Clock Speed:
RAM: 16GB 10-11-10-30 1866
Cooling: Noctua D-14
OS: Windows 8.1

Normally when I'm running it on default the voltage on auto is about 0.888.
I set the CPU Ratio to 42.
Ring Ratio to 41
EXtreme Memory to Profile 1 which load my memory at the right frequency.
I set the CPU Core Voltage Mode to Adaptive
the Voltage to 1.1
Ring Mode to Adaptive
Ring Voltage to 1.075

The problem is when I go into CPU-Z and check the voltage it is always running at 0.888. It would run at 4.2GHz, but after like 1 minute the computer would freeze. It would not go to the voltage I set at in the BIOS.
I also have the extra power connector to the MOBO.
I'm fairly new at the OC, so any help would be appreciated.
 

Davil

Distinguished
Feb 2, 2012
311
0
18,960
Well you have your voltage set to adaptive which means it's not going to be at where you set it to. 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, it is recommend to use Manual Vcore, NOT Adaptive or Offset Mode.

Long story short try it with voltage in manual mode.
 

Amerad33

Honorable
Feb 11, 2014
7
0
10,510
I think there was something wrong with the cpu-z. If the computer is idle the core voltage run about 0.100-0.200. But if I run Prime95-In Place Large FFT, I get 1.280V at 4.2GHz and the peak temperature is about 60C (I ran it for 8 hours). Should I try to increase to something higher than 4.2? What is limit I should stop at with the CVoltage?
Thanks
 

Davil

Distinguished
Feb 2, 2012
311
0
18,960


That's what adaptive does, it doesn't fix it at a specific spot, it allows it to vary depending on the load which is in turn better in the long run. You could go up to about 1.3 and try 4.3.