2600K weird OC behavior past 4.4 GHz

[Welite]

Today I decided to OC my old 2600K a little bit more, since it was not quite keeping up with my GTX 970 in some games. Previously I had OC'd it to 4.1 Ghz (was running fine for more than 5 years). I decided to clock it more, however my mobo only allows me to do x42 multiplier, so to make it 4.4 Ghz I had to raise my base 100 Mhz to 105 Mhz (105x42). It also clocked my DDR3 to 1400 from 1333. I have all voltages set to Auto for both CPU and RAM. Everything runs fine, did even some burnout and performance tests, everything perfectly stable, no crashes. 

 

However when I try to set the base to 106 Mhz for example, my PC wont boot at all and after 3 failed attempts to boot it says it cannot run because of recent overclocking and resets my OC settings. How is it possible that such a small increase in clock made my PC unable to boot ? From what I have read most people first get system instability (BSOD etc.) and not directly unbootable system when increasing clocks step by step.

 

 

My friend has 2600K also and he is able to clock it up to 4.9 Ghz with all voltage settings set to Auto as well. I know that chips may vary in quality ... but such a huge difference ? My passmark score is 9700, my friend is able to make 11 000 score in the same test. So 10% more performance just from that 0.5 Ghz extra clock.

 

 

Temperatures are below 60C when my CPU is on 4.4, I have the biggest noctua air cooler with 2 fans and large passive part, so heating is not a problem at all so I feel it might be able to run at least at 4.6 or so.

 

 

 

Thanks for any ideas and tips.

[AngryBeaver]

The blk clocks on the 2600k was pretty picky.. so most of the oc was done via  multipliers. Can you update your bios and maybe get a higher multiplier? Seems weird for it to be limited. You can also try a high blk to see if that helps. Maybe try lowering your ram ratio and using a 200mhz blk with a 22 multiplier.

[Welite]

14 minutes ago, AngryBeaver said:

The blk clocks on the 2600k was pretty picky.. so most of the oc was done via  multipliers. Can you update your bios and maybe get a higher multiplier? Seems weird for it to be limited. You can also try a high blk to see if that helps. Maybe try lowering your ram ratio and using a 200mhz blk with a 22 multiplier.

Are you sure that raising blk to 200 Mhz and lowering multiplier is a safe option ? I have never seen anything quite like this so I am kinda scared. I want my CPU to last at least until Intel's 10nm desktop CPUs will come

[dfsdfgfkjsefoiqzemnd]

If the multiplier doesn't go beyond x42, you probably have a regular i7-2600 instead of a 2600K.

 

Messing with the BLK on Sandy and Ivy Bridge does give you higher frequencies and better benchmark results, but in real-world usage you'll find that the system easily becomes unstable.  I'd revert it back to stock BLK.

[Spakes]

You are not supposed to change BCLK frequency on Intel chips since intel Core i-series were introduced. That will cause way more problems than on LGA775 CPUs (because a lot of stuff relies on base clock freq generator). Just do yourself some good and use 100 MHz flat... Ok?

Also, try using your CPU on your friend's MoBo. Maybe this is where problem lies...

Troubleshooting 101: If something in complex system fails, swap parts one by one that are related to issue first.

[SkilledRebuilds]

RIP 1-2x USB PORTS on my old BCLK CLOCKERs.

(Z68, z77, z97)

Z68 has outright died, z77 lost USB2 ports, z97 lost about half of its USB2 ports

Thankfully, everything else works.

Just tinkering spare boards,.. why not..

I have a thread somewhere here about my 4690 nonk at 4.1something using BCLK.

 

Talking values of 104Mhz-107Mhz

Wouldn't risk it overdoing values YOU DONT KNOW ABOUT, undocumented changes are likely also happening and shortening lifetimes.

 

Anecdotally experienced.

Just get a better baseline CPU (K Skew or Unlocked)

Unless the board has MCE or Enhanced Turbo allowable Then I'd just not bother with BCLK anymore..

[Jurrunio]

That's already impressive for a 2600 non-K, Btw it started with Sandy Bridge that BCLK doesn't go more than 108MHz unless you go extreme (sub-ambient overclocking). My 2600k needs to boot specific settings first before I can apply 106.3MHz BCLK to it, and if it I leave it turned off too long it won't post that BCLK right away and I need to rerun the boot slower settings procedure again.