Haswell Further Overclocking with ASUS Z97-A

[Tek-Buzz]

So, i have just overclocked the I5 4670K to 4.0 at 1.225 Voltage and it seems it is stable at that,

I tried Bumping Up the CPU Core Voltage to 1.275v and set the core clock to 41 but still it crashed? even at this voltage it is not even going 100mhz more?

I've followed a bit of this guy's video and set the max cpu cache ratio as my core clock (40) without exacly knowing what it does.
https://youtu.be/4Pilo1E6kXQ

In this video he also put voltage to adaptive, buti set to manual and setted the voltage to 1.225.

 

[Eximo]

More then the core voltage needs to be modified, and 4.0 shouldn't really need any extra voltage at all.

1.275 is getting up there. What do your temperatures look like? What is your CPU cooler?

Cache, Bus, and Ring frequency don't really need to be messed with until you get up in the 4.4GHz range.
Not all 4670k or 4770k can reach such speeds though.

Here is my favorite guide:
http://www.overclock.net/t/1401976/the-gigabyte-z87-haswell-overclocking-oc-guide

Here is a local guide:
http://www.tomshardware.com/forum/id-1722630/intel-god-quick-dirty-guide-4ghz-haswell.html

More recent reading:
http://www.overclock.net/t/1490835/the-gigabyte-z97x-overclocking-guide

Now I don't have a Gigabyte board, but most of the terms are similar.

 

[Tek-Buzz]

I have a cooler master 212x CPU cooler, temps never go above 65 (stay under 60c mostly) in aida 64 which i ran for about an hour.

I don't think lowering the voltage from 1.225 will be a good idea as already i saw crashes at 1.275v at 41x core speed , given extra 0.050 v but still got a crash at 4.1.

I don't know if i'm doing everything right or no, is it suppose to happen?

 

[Tek-Buzz]

I only changed multiplier from Auto to 40, set max cpu cache ratio to 40 aswell (gonna put it to auto) and set the cpu core voltage to 1.225 manual, that's all i did in bios, everything else is just as it was.

And from the guide there are like 3 diffferent voltages, but i only played with 1.

 

[Eximo]

For the most basic changes:

Find Vin or Vinput, likely at 1.6 volts or something. This is the voltage supplied to the VRMs that actually step down the voltage to the CPU. This should be at about 1.8 for a decent overclock.

You may also want to look into Load Line Calibration (LLC) this prevents rapid changes in load from causing voltage sags, which can cause instability.

I would read through those guides further as well, a lot of detail in there about what, when, and why.

The early release Haswells had some really bad examples out there. My chip is about average and requires nearly 1.3 volts to reach 4.3Ghz. I ran it stably at 4.5Ghz, but the temperatures were too great (above 100C) A few people that tried overclocking were actually stuck at 4.1Ghz or so, so I would caution you not to push it too hard, since your cooler is only good for this, not great.

 

[Tek-Buzz]

I ddidn't found the Vin or Vinput anywhere, but i had the CPU input Voltage, which was set to auto at 1.7 . In HWmonitor, it is written as Vcore i guess.

I tried putting the input voltage of CPU to 1.9 v, core clock to 44, and cpu core voltage to 1.3v , it still gave me BSOD at aida 64 for about 1 min.

I have currently set it to 40 , voltage to adaptive Vcore or CPU input Voltage to Auto (1.760 v) and ran aida 64, it appears to be fine after 5 minutes with max temp of 63c and since it is adaptive the voltage i saw was 1.211 to 1.279 , at 100% usage it goes max about 1.279 v with temp about 64c, is it still bad?


Also with everything stock in CPU - Z i had the voltage of 1.211 v , i put everything to stock again and now got same voltage that is 1.211 in CPU z and about 1.078v in bios.

 

[Tek-Buzz]

Hwmonitor statics : https://gyazo.com/1d06845fe8e06a9bfd343da22e56fdca

 

[Eximo]

CPU voltage would indeed be input voltage to the CPU's VRMs. Seems like you have a less then average chip, but don't necessarily try changing everything at once. Try running the lower frequency with the higher voltages to see if it still crashes, if so, then the high voltages are the problem.

If I remember correctly I am only running 1.8 CPU input to reach 4.3Ghz, CPU voltage of 1.279 (Which is rather poor), LLC at the lowest level, Slight increases to memory, PCIe, and a few other minor voltages.

Load Line Calibration can make a big difference to stability, you should still look into that.

All that said the real world performance difference between 4.0 and 4.2 or 4.3Ghz is minor.