Haswell Advanced Overclocking using ASUS Z97-A
Haswell Advanced Overclocking using ASUS Z97-A
I just increased the overclock of the I5 4670K to 4.0 at 1.225 Voltage and it seems stable there.
I tried raising the CPU core voltage to 1.275V and adjusted the core clock to 41, but the system still crashed, even at that higher voltage—no more than 100 MHz increase.
I watched a video where someone set the max CPU cache ratio to the core clock (40) without fully understanding the effect.
They also used adaptive voltage but switched it to manual and set it to 1.225V.
CPU voltage serves as the input voltage for the CPU's VRMs. It appears you have a chip that isn't very average, but don't rush to change everything at once. Consider testing with lower frequency and higher voltages to see if crashes persist; if they do, high voltages might be the issue.
If I recall correctly, you're only using 1.8 CPU input to achieve 4.3Ghz, with a voltage of 1.279 (considered low), LLC at its minimum, slight adjustments for memory, PCIe, and a few other minor values.
Load Line Calibration plays a significant role in stability, so it's worth exploring that as well.
Overall, the performance gap between 4.0 and 4.2 or 4.3Ghz is relatively small.
Additional adjustments beyond the main voltage are necessary, and 4.0 shouldn't require any further extra voltage. Temperatures are rising at 1.275, so check your CPU cooler. Cache, bus, and ring frequencies aren't critical until you reach around 4.4GHz. Not all 4670k or 4770k chips can handle such speeds. Refer to these resources: http://www.overclock.net/t/1401976/the-g...g-oc-guide Recent updates: http://www.overclock.net/t/1490835/the-g...king-guide
I have a cooler master 212x CPU cooler, temperatures never exceed 65 (usually under 60°C) in an AIDA64 which I ran for about an hour.
I believe lowering the voltage from 1.225 won't be helpful since I already experienced crashes at 1.275v during 41x core speed, even with a 0.050v increase, a crash still occurred at 4.1.
I'm unsure if I'm doing everything correctly or if this is normal.
I modified the multiplier from Auto to 40, adjusted the maximum CPU cache ratio to 40 as well (planning to let it auto), and changed the CPU core voltage to 1.225 manually. That’s all I did in BIOS, with everything else remaining unchanged.
From the guide there are three different voltages, but I only worked with one.
For the simplest adjustments, locate Vin or Vinput, probably around 1.6 volts or similar. This voltage feeds the VRMs which then reduce the voltage for the CPU. Aim for roughly 1.8 volts for a solid overclock. You might also consider Load Line Calibration (LLC) to avoid sudden load shifts that can lead to voltage drops and instability.
I recommend studying those guides more closely, as they provide detailed guidance on timing, conditions, and reasons behind each step.
The initial Haswell models contained some problematic examples. My own chip performs reasonably well and needs just about 1.3 volts to hit 4.3Ghz. I managed stable operation at 4.5Ghz, but temperatures exceeded safe limits (over 100°C). Several overclockers ended up capped around 4.1Ghz, so I’d advise against pushing too hard, especially with a cooler that isn’t very effective for this workload.
I didn't locate the Vin or Vinput anywhere, but I had the CPU input voltage set to auto at 1.7. In HWmonitor it should be shown as Vcore. I experimented with different values: CPU input voltage 1.9V, core clock 44, and CPU core voltage 1.3V, but still got a BSOD in AIDA64 for about a minute. Currently I'm using 40, with adaptive Vcore or CPU input Voltage set to auto (1.760V). After running AIDA64 for five minutes, the temperature stayed around 63°C, and the adaptive voltage ranged from 1.211 to 1.279; at full load it reached a max of about 1.279V with a temp of 64°C. Is this still problematic? Also, when I reset everything back to stock in CPU - Z, I got the same voltage (1.211V) in CPU z and around 1.078V in BIOS.
Static information about hwmonitor: https://gyazo.com/1d06845fe8e06a9bfd343da22e56fdca
CPU voltage serves as the input voltage for the CPU's VRMs. It appears you have a chip that isn't very average, but don't rush to change everything at once. Consider testing with lower frequency and higher voltages to see if crashes persist; if they do, high voltages might be the issue.
If I recall correctly, you're only using 1.8 CPU input to achieve 4.3Ghz, with a voltage of 1.279 (which is quite low), LLC operating at its minimum, minor adjustments to memory, PCIe, and a few other small voltages.
Load Line Calibration can significantly impact stability, so it's worth exploring that as well.
Overall, the performance gap between 4.0 and 4.2 or 4.3Ghz is relatively small.